Malicious PDF — malware analysis report

Static analysis result for SHA-256 8935fbef26712921…

MALICIOUS

PDF

89.8 KB Created: 2021-06-30 02:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c48c7db41d9f46def39ac93f7fb851a3 SHA-1: b7e8c8ad1e23093f16a9c52c1d716bc9140d1ee4 SHA-256: 8935fbef26712921d8f5d02d2e63b342aaf42090bce2c52c7bd4bda8c12f2a2c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains heuristics indicating it is a phishing lure, specifically a fake invoice or payment request. It embeds multiple URLs, many of which point to compromised WordPress sites, suggesting an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=oracle+user+guide+pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/85919500d11830b0048d08f5ff8e716d/xutepadogagexetufe.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/m65mgt0ob3mnbvtk3vmmbs7s46/furumudivevexelavafale.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/en6gqgmv7bmkah2h1r5sl5jf01/pononolexitetazuve.pdf
    • https://cabsfromheathrow.com/userfiles/file/94855919644.pdf
    • http://apnorajasthan.net/userfiles/file/giguxiduweleluraditomu.pdf
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/18439132777.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0f4332033a03ff962e5d2a698a50e5b5/72808951600.pdf
    • http://quickvideo.nl/userfiles/file/pemifubanedokiweru.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/81e156d177c1f204390606f31ef00fce/texogum.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b7cb59c9e---27212513286.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084459f62fb4---ruwaraferum.pdf
    • http://www.aqsclimited.com/EditorImages/file/pipageronapotomevog.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/a222fa6465feb7e88ac4030560e8416d/40872120053.pdf
    • https://bevelec.com/bevelec/dossierMois/file/72229554657.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8cc76c81---peluluwopunafiviwuvesixi.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/63788a010870fb7eab00cae3afb47e7e/kubukitagojabojete.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609060bb2b575---vujenevazifemifalevove.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c50cde2bab1---59334038854.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daad4a34ce---38409360132.pdf
    • http://alpha-th.com/userfiles/file/sajutataravojogap.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/v0njk8p544inept2cj3stcnmh2/mixokogipijavuxanezovifug.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dfa8bb9bd---tonejadunaxigaruwabumat.pdf
    • https://accuratesearch.com/userfiles/file/16925665136.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d0664f3a---zasitapodudalavezenumup.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe81.bin
d91547c761007f39735deabb42dd4df0cf230d35e3514ae2265ddd8bce10fded		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 10596 bytes
font_01_sfnt_off000116a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A5 16792 bytes
font_02_sfnt_off00012eb7.bin
88ac171edb5be92a93d0ed8d286499c759ee710c35cee2258948aebc980fa5c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB7 16656 bytes

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