Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffd6e37e3f8a9137…

MALICIOUS

PDF

38.7 KB Created: 2021-09-05 06:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 294f08e77bdc55da0e5f02f7a86312d1 SHA-1: 5247878a84fd39a44971624b443011eafed0119d SHA-256: ffd6e37e3f8a913715aa2a519bc80cf47687dbc6eb0710566574d3d789296b1c
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 0.8504

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://medvor.ru/uplcv?utm_term=english+file+upper+intermediate+workbook+pdf PDF link annotation
    • http://hosteleriayvending.com/ckfinder/userfiles/files/11094431776.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mj80n02i9gk6id01qd25257vis/xawutemukukevamexuwomi.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bdfa766837bec5428f4521d352db68ba/60891515481.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/83524568015.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/53945693407.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/28003771997.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/3lluffpsjblu1fb9dnp4cbl0es/51894086157.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/9mt5bc08300keth0s0j6dkrhhs/bumud.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/xuxuxiw.pdfIn PDF document text
    • https://teamcode.net/upload/files/25247013805.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/34904129499.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/9514adaa40fffb4f9a7afb0b45904559/fazav.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xelozikofowuja.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/zuxovuwufubaxawuluzumesek.pdfIn PDF document text

Related samples 8

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