Malicious PDF — malware analysis report

Static analysis result for SHA-256 86fe500f0fa5daa0…

MALICIOUS

PDF

39.2 KB Created: 2021-09-02 16:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: e8c967824e3b54ce30d8a948b1b9db19 SHA-1: 9ab9d8fd04f92645236b4778b8c22f40da48c552 SHA-256: 86fe500f0fa5daa0412aa58241fe417e4877a90670db5fe07db9eef3c3dd1b9b
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 0.8588

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 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://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/kiwedug.pdf In PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/btnm0f9drj042n85tl9so1s16d/xaluvumuvobonidomuk.pdfIn PDF document text
    • http://bienbao.org/uploads/files/8322666582.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16096858739c4f---70641677848.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/satemirowadafimijovuli.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611ff26bbcd1d---9549850389.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/pgn1nqgq18vpmnr7r22mhgtmdv/78968712974.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083278a208ef---12430129477.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/tadovukivemifukavit.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbf6b8e5b11---toragusaz.pdfIn PDF document text
    • http://placc.info/up_image/wisabisija.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/pomuvaf.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/pazomaxofaduja.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c1c3db258c361b3a37633744b00395b0/govokuketilewek.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/8157855863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=bertrand+russell+pursuit+of+happiness+pdfPDF link annotation

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