Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f005e3af677d538…

MALICIOUS

PDF

72.1 KB Created: 2021-05-17 17:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae71ae45393c25cdd5ad2c31ce63f41a SHA-1: 829aa6d06da0680043cfe623ff01a9f38f8a3656 SHA-256: 9f005e3af677d538c110fcd47bb6677c43a01a2299317680fe450e873997ed02
154 Risk Score

Malware Insights

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

The file is a PDF containing numerous links to external websites, many of which are hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the structure of the PDF suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8800

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 http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a683f145ae---fawovabuxujubipilasura.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/r9i6e0u2ukeqa0rl9p22nv2bpi/77813003946.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/78fd25d792f6dabeb7a05d16a9c862c2/bugeriguruweba.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/v3g413eo1hrempdl8og4cquh2h/sakimotix.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca882169f6---judadena.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/5299191f34442478b30de3b114afdd34/23783577033.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ca79b7ade9a90c44ae242e23bfa60805/vozixefonewotixozugakir.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfec903a1c---nunematimojaso.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078c2b9cf4c7---jeburizafamizuvuduras.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b10acb809b---zubilevimosujobufofupuzim.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607351760a867---68180015051.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5abe1dbec5dd83c24c0f47964d213dde/68243369307.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ad95f302b---77611015229.pdf
    • http://anandtouristcorporation.com/uploads/98501706061.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/85v7gf60i9knrboua1ngbvp39k/73553325946.pdf
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608614060ff09---jaxawovirupuvameziwamokul.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=excel+vba+application.+worksheetfunction.+vlookup
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/25155db2002041f7053414cbf3cd8827/40256396517.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea94.bin
c19f2d168cd9b61be969c1a9a9639e70b8efcb1f03c99ed928a6b821c7075925		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA94 5396 bytes
font_01_sfnt_off0000fcf5.bin
ff107a2f8867fbf93d5639cb7e0f1f023d6d869f66b94b01fa379c898c95fb87		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF5 10808 bytes

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