Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cac2e76e273cd05…

MALICIOUS

PDF

77.2 KB Created: 2021-06-15 21:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b20f62f5b448d1c9f299b64c5d27ebda SHA-1: fd40d32d2b25eb9cf4e05c08ec5f23a634a4ff33 SHA-256: 2cac2e76e273cd0549b6cf9e63151851aa4b9acf07fad68d1f2cd9cd1284332c
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to a popular book title. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://medvor.ru/uplcv?utm_term=harry+potter+and+the+chamber+of+secrets+genre
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/rd4btfo573sojsqg3hg44ciebt/fenakarakulaful.pdf
    • http://foto-klub.dk/userfiles/file/36406847919.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fcb702231---83144865990.pdf
    • http://ttmplus.com/userfiles/files/zekumixavudato.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160837a1895ae4---zuxowulunuzibifa.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1865c3564---59747421051.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/93da92ab274daebea053da21c3d153b4/67945508229.pdf
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1bd09063235c1a654ef35507461082f8/wovisikekarogo.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a398695f47b---lulofodus.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rog4efd11rj4ms9qjcdnsmbph5/45525421192.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608251605196a---vusifusen.pdf
    • http://all-pass.com/folder/editor/file/53397160511.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/9bc7fthg8r8gqcee0rmthk33d7/41987599459.pdf
    • http://hi-techfiber.com/userfiles/file/pubixujikodotinurovol.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/5mn4jmftf00gv715pbq1fu9cu1/lixinigaxevuroxaxitigi.pdf
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/86566264420.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b2c1d3379---54853883176.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb34018ff5---98167540772.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee14.bin
383b31303b0d7e5e8fa0f1899531c42a776f5b89c88ed7775ed38cd2e31398ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE14 5740 bytes
font_01_sfnt_off00010176.bin
42095a5698883eadd3cc3eccc4513996ae5621dfc757db3f110bfc31d87b7685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10176 11196 bytes

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