Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e671e43c19bc81b…

MALICIOUS

PDF

38.3 KB Created: 2021-07-07 12:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: d56324c64bfc2de97796ad17ca1ae185 SHA-1: 11a578efca5257929ace179fb1e9dea1c621bb86 SHA-256: 8e671e43c19bc81b1b4eda30f55f5d9e5e768b043f97721ec4b8daf04b04c12b
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 0.8611

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 http://linpus.com/app/webroot/userfiles/files/57931734813.pdf In PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/ruboxifowujaxovutamug.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099be7aebdf7---98027388814.pdfIn PDF document text
    • http://pi-consulting.ch/download/41755391343.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/36344976208fc1308a7c00cf9aa5ae5c/xugixivosomiloki.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/gidisotonizawebedefakufam.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/iv16pelsr0j32ickaefono0vc0/77808390882.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac325600302---sakogapisi.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/69517365264.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/87980888900.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/4dt7f1t428up691q8e964tigvk/76950991696.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/migedidasitar.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/2679533480.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=snyder+cut+justice+league+online+freePDF link annotation

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