Malicious PDF — malware analysis report

Static analysis result for SHA-256 a226f6274d022f70…

MALICIOUS

PDF

72.5 KB Created: 2021-09-18 19:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 389af2996b7f1f58763b1f2d99b793db SHA-1: c1ecdead58a91079f5135ee300b5dc91ba630961 SHA-256: a226f6274d022f706f5b743c46c10900c6859208ae942b5adbe116b6d9d3a650
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary goal appears to be directing users to potentially malicious websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8784

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chcial.ru/uplcv?utm_term=schaum%27s+outline+electromagnetics+solution+manual+pdf PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ac008f07d---xukedafexafidudimanezuz.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/60554104434.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/81251749077.pdfIn PDF document text
    • http://bienbao.org/uploads/files/dajujavozawabofetulujesiw.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/97195f73fbec7ddd9a0e5f0f3bfd47d9/57977198358.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/wufegisuzewewagigag.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ed07cad34---24690673930.pdfIn PDF document text
    • http://52963566.com/upload/file/202109070411300209.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/1334783129.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/26903508420.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/49306767985.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/2717492102.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090210042812.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/17434274544.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/38596061678.pdfIn PDF document text
    • http://maszyny.pl/userfiles/file/sebez.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132190b55008---61473304935.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/jaxibom.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ca020689d7a1964bf419b7ee10aa8ca3/78298143227.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lapave.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/bijubibaxuzomafogo.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC745 11276 bytes
SHA-256: 0bedb098c7b611191a56cc49f27667a55b86fc3d08be29b6bd8b64ea8a59f50f
font_01_sfnt_off0000e164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE164 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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