Analysis by: Nice Yutuc
 Modified by: Cris Nowell Pantanilla
ALIASES:

JSdfka-gen [Expl] (Avast),Script/PDF.Exploit (AVG), PUA.Script.PDF.EmbeddedJS-1 (ClamAV), Exploit.JS.Pdfka.fma (Kaspersky), Exploit:JS/Pdfjsc.Z (Microsoft),JS/Exploit.Pdfka.PHT (NOD32)

 PLATFORM:

Windows 2000, Windows XP, Windows Server 2003

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

It executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

  TECHNICAL DETAILS

File Size: 13,262 bytes
File Type: PDF
Initial Samples Received Date: 14 Feb 2012

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Dropping Routine

This Trojan executes the dropped file(s). As a result, malicious routines of the dropped files are exhibited on the affected system.

Download Routine

This Trojan then executes the downloaded files. As a result, malicious routines of the downloaded files are exhibited on the affected system.

Other Details

This Trojan connects to the following possibly malicious URL:

  • http://{BLOCKED}hs.dns1.us/w.php

NOTES:

This is Trend Micro's Smart detection for a cluster of specially crafted .PDF files that exploits a vulnerability in Adobe Reader and Acrobat in order to download or drop the possible malicious file wpbt0.DLL. The download link depends on where the malicious .PDF file is hosted. The downloaded file is usually saved as %Temp%\wpbt0.DLL.

  SOLUTION

Minimum Scan Engine: 9.200
FIRST VSAPI PATTERN FILE: 8.776.04
FIRST VSAPI PATTERN DATE: 15 Feb 2012
VSAPI OPR PATTERN File: 8.777.00
VSAPI OPR PATTERN Date: 15 Feb 2012

Step 1

For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.

Step 2

Scan your computer with your Trend Micro product to delete files detected as TROJ_PIDEX.SMO. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.


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