Malicious PDF — malware analysis report

Static analysis result for SHA-256 94362de7a68786b1…

MALICIOUS

PDF

54.0 KB Created: 2021-06-13 18:01:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: de9e70120b429e1d758d115fb3bcb5b4 SHA-1: a315e4dc71fad920da55a703c2870b15bd356f81 SHA-256: 94362de7a68786b131f87aa4dc0833c605ca873090213f69cbc4ae796b363388
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations. The document body, though heavily obfuscated, suggests a lure related to academic material, likely intended to trick users into visiting these malicious sites for phishing or malware downloads. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a link farm designed for SEO poisoning or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7712

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://krisoc.ru/uplcv?utm_term=principles+of+macroeconomics+by+hl+ahuja+pdf PDF link annotation
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/34a2544afca6c57964291ea1091811c9/sofesipagurutuxewemu.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/sm4ct7cv2hqb2p6gbc5otj2i01/65374183419.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36d8286b92---79721044005.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3a779e4dfb7eb0a6dba0b8dd234aecdf/jumateb.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/85904740996.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077988c8153d---84065395344.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8aac0a1144c09d561e7dee6cefee85d8/10704593494.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i21dpn557dj7ljbddb2kaonj63/83205832723.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09826b26e5---lixekesamaxexu.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/88664670049.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/rekodoxokisujo.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fa8180bac67e8a3c26311c8b4535be0a/43704342573.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160aaeb57e841e---xesodataxerenekirobofoka.pdfIn PDF document text

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