Malicious PDF — malware analysis report

Static analysis result for SHA-256 c758ac264aa663fa…

MALICIOUS

PDF

88.9 KB Created: 2021-09-02 17:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eb6fb6b6b9441673ffa22b6338580f62 SHA-1: 59464ef3406379be783bb42d467982df3c61a5cf SHA-256: c758ac264aa663fa906a5378c2dcd51dd4f7ae8312a06180d260411184449149
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The 'SE_CALLBACK_LURE' heuristic indicates a phishing or tech-support scam pattern, and the ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and heuristics point towards a phishing lure designed to lead users to download malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098308d07234---13894079605.pdf In PDF document text
    • https://megashina24.ru/files/files/xedizokarewejegudire.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6b48b2dfd---zofavej.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c664e6121ea---nupelete.pdfIn PDF document text
    • http://fenotropil.ru/userfiles/file/xarol.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/31347988037.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/b7440867bc33749423321d2f1c01e44c/jomugivoxuwimoz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c88d60171---nibaxarexabavojiluxukit.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160942b08a73ba---zojilegogimalufutosasow.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/febax.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/70697414676.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/43175607257.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/71256135275.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/676cf59716c6079ac5e0ad44055b0a1e/53468380534.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/kofefinewumegogem.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a529aa1200---54856467745.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff565da3f8---tenodifexokaxozato.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/57868187786.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/6492655718.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ca957a2e---78755455831.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/lefakugoweganuravapanire.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/b49303161ad3b6897ce8cff479316f50/92857943976.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/5ad07b06d48c58dc3d2b92f5617637a9/76003231542.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160984b9c869b2---sifatakopurunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+download+surah+al+mulk+pdfPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0B 10828 bytes
SHA-256: 3a95b26c6bb1ea22ba3108b6ffb40cc002654a7779a4c65618c7763115131bbf
font_01_sfnt_off000107e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF2 20268 bytes
SHA-256: bdcf7db3fe99a44e88a471525e39f6d51dc9e3845026b58759d4b15348ffde3f

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