Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5b85f6e02da1c8…

MALICIOUS

PDF

93.0 KB Created: 2021-06-16 22:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ba354c71133c45dafeee3b408fcb7c72 SHA-1: 180baf657cd65a6d26d489726a9a7faf9c5eac12 SHA-256: ff5b85f6e02da1c8c0c48bdd36e140a56c53d2f5226cd7ab4cb469dc86f0862f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The presence of the term 'big red key tarkov' in a URL indicates a lure targeting players of the game Escape from Tarkov. ClamAV and ML classifiers also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8955

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://synerhu.ru/uplcv?utm_term=big+red+key+tarkov PDF link annotation
    • http://outspokenholland.com/userfiles/fckFile/20210608081716.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b653edc370---13175186919.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/4565509804ae49cfdb42fa33e4178c4d/97643793442.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/pejubikuwinupagonapebapod.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/54552678402.pdfIn PDF document text
    • http://beta-rc.com/upload/files/25890392347.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16089bf12567ab---32085991357.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/fowokomatebawaletege.pdfIn PDF document text
    • http://sushi-belovo.ru/files/31208346111.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa964df69c---kigosumilusitupibopoxa.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/10847096608.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/6daeffec19989e6c5eb1a03d2e2dd982/dikomawiwexidumoradule.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/0686399a5637b81809c720c9007b8942/xezolipixagiwo.pdfIn PDF document text
    • http://unsersohn.ch/images/file/40348826300.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/39309122750.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5f9ec9023---bapebubuxidugosagaguma.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be80f73f86a---92662697691.pdfIn PDF document text

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