Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f2cbd3259043c4…

MALICIOUS

PDF

38.9 KB Created: 2021-09-04 01:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d1d3aa7ba029e6380875fd294c9a9847 SHA-1: 8f9888ad7bb2fe8051501f532ef3748dd3e1634b SHA-256: 55f2cbd3259043c4f09a43f485c92c2328c623d1658db72c7c5c718ed6f77b54
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier. It functions as an image-only lure, presenting a screenshot to trick users into interacting with embedded links. The numerous external URLs point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8588

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 38 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 https://catamma.ru/uplcv?utm_term=information+pyramid+pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/bb53171c425322c89d57ea5a765d6190/95387803197.pdf
    • https://edu-mate.kr/_UploadFile/Images/file/wekitulezudi.pdf
    • http://lordoptika.hu/files/files/79111863870.pdf
    • http://ersenergy.com/UserFiles/file/48209607723.pdf
    • http://leprofit.ee/cmsfile/contentfiles/nafojidaxavuzepukezax.pdf
    • http://boathousebrokerage.com/userfiles/file/tinomusimitijebusazap.pdf
    • http://cartopack.be/Images/file/wawanuxon.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/n3bh43icd09ppt64bjd4q3kml1/24485686452.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608760a793a43---80946257384.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a080411831e---jawetopezazugizowepesi.pdf
    • http://termocity.by/pics/files/depin.pdf
    • http://nuovartea.eu/userfiles/files/mevifu.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/6398be272cb17d95caa0313a4d418ac6/lutane.pdf
    • http://studiolaviano.it/userfiles/files/31544931493.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/fojobituwabifuzawulirovaz.pdf

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