Malicious PDF — malware analysis report

Static analysis result for SHA-256 171dc4e40ff21113…

MALICIOUS

PDF

72.8 KB Created: 2021-06-24 18:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3fc64159395b4a08817f6b377a91b93f SHA-1: fb4585f8701f42670ec29d9262b469babb29bbb9 SHA-256: 171dc4e40ff21113bd32eea52ba3b5fa120404b25493d8847b7fe9e1b19ebdfc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The embedded URLs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/7an5s6tcj9nb1500i36bnv5bi1/metipubowo.pdf In PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba076c9be---24413365965.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609421f6e881c---63823153123.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/zizotes.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/a9a8decc89de079cd7891fd942316a78/tepuxetareli.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/95272249786.pdfIn PDF document text
    • http://talleresjpg.es/img/file/sejavulitakibow.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/62407989248.pdfIn PDF document text
    • http://naucseto.cz/storage/bamisokomatagavoj.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/oqc6l794bcev30l31c995pn364/taxesupajil.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/93afc388c6bd499063f3ed855455a9d6/xonirunesuketidagamimesi.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4abaf21d2e9e0d7e4ffbb75d117e2576/gusopo.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210520162440_k5ja46.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=callister+materials+science+and+engineering+10thPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 5452 bytes
SHA-256: 1df82631b49a064c7aca2c5ebd317b1a4409335118ca51cb5a6162c7bfe3f5d7
font_01_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 10708 bytes
SHA-256: 67f39822a93e1638fae14784d7e0b273ee5f3dfb48143583b011c6abc96e2588

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