Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8721e097f43546…

MALICIOUS

PDF

39.8 KB Created: 2021-06-21 13:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8f5dae94ff5c900043f9635ed06aa413 SHA-1: ab3b1e8dff9490ca9b562aa85010566f09c34a55 SHA-256: 4a8721e097f4354665c688f9cc93662d8f9017884a877980c9f6bb49537d52c8
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8503

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://policylic.com/uploads/files/55114477575.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b9d95ef9436a8f8011d5128706603601/zitigabogexetasifir.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e316fa3554---56384673132.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/vojitobulavovenirulod.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/lagufareviw.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6810e9267c---dejabede.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/66561814868.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/94a1d63872ba345ecf3fcd4e3d91a48d/38846117309.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/tilutifiwe.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609de7e5607d5---53103158998.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/kamujepako.pdfIn PDF document text
    • https://go2germany.ru/files/file/32237424050.pdfIn PDF document text
    • http://mobilenmr.com/files/files/robewaziwug.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5h9bmqmae1mucepb2d7armiq5u/93315547635.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/cdadf506460f4884b5beadb9cea383e2/21434381151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+difference+between+igg+and+igePDF link annotation