Malicious PDF — malware analysis report

Static analysis result for SHA-256 babf9d0e57fbf0ce…

MALICIOUS

PDF

64.0 KB Created: 2021-05-15 21:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d861be5b6a82ce9b21d09a10cd0c960d SHA-1: f4216a8e31e750058c0bfd75d100c79a70add362 SHA-256: babf9d0e57fbf0ce4d12d9ef396bbb501f34d185a953b9872471a4c7d235fc8d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing lure designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097408a9c343---59289888968.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160755d8fd3783---33368652169.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/0f996801afff594ef2401f351879d5be/97698293053.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607619242121b---95176211744.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0650797d81fbcf61d752ea9211dd7f07/71049472464.pdf
    • http://babamoleskine.com/files/file/gonidizuzoneku.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0de6136d---gumeg.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6a6902d0eb828b19518334e43c5a5ed1/ripogewunawit.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/b45abcca977dccda92d65cf1fc7251b9/kutegureruju.pdf
    • https://autosaloncenter.com/uploads/file/49505329359.pdf
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f643abeb44---zivemurotax.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7e6d89e6348db9ae71d1151b67d87806/37032249847.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843b07b23a6---gunotepepitutili.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608aac34787c6---muvabaka.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbab4d206c---dikixobikukuxu.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/277ca040707f3faf4a26ab96917948df/5069144551.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=a+million+dreams+piano+free+sheet+music
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d664.bin
2c8cd6621867d00589006117f3f3248a50e8d6c97d3eb831854785b2abd02feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD664 5384 bytes

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