Malicious PDF — malware analysis report

Static analysis result for SHA-256 967e4cc6a97e21f7…

MALICIOUS

PDF

50.2 KB Created: 2021-09-03 02:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 029b0a30ab3b26a2fdf38c50ef818bb6 SHA-1: b0ba27e18eba51e32af1bfb906b372bfd8f71978 SHA-256: 967e4cc6a97e21f7fc290e4b1562e7ff514f224a136d5976f31efd94fd3bb26f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate attempt to obscure the final destination and leverage potentially compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9369

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=hit+the+road+jack+partitura+piano+pdf PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/e4tbf76l3cv6cqclqn587gnc55/xigiremufedekiwolisarev.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/86390552548.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/lolanimisezogasirefabuxa.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/nuvofuridaxigobuludon.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210619_202019.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79c3632da2---zovigisixi.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/tozazamumabojufumaxizum.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210530015555.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/35080697628.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/borukuxina.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/42217465738.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/12931761686.pdfIn PDF document text
    • http://jp-cable.com/d/files/8602035656.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/sj7c66g7tm608umboi55277vkd/34199165967.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2k08a3mu4i4qmmhkdn7rae3v23/wivud.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/9d40af3aa58159e667257a350fc750eb/58085780707.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/23712421846.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/97e03c4b11c92ee5e73acf8f57796aff/89018019429.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/sufgu6o6m5m40s5o9k9s11ihp4/69160515068.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fa3f9eee5---ximakexigilejujedi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ebb7a3235---17981720935.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3da3e1f02a---16279674610.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/39221857483.pdfIn PDF document text

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