Malicious PDF — malware analysis report

Static analysis result for SHA-256 814c7bcaba5faeef…

MALICIOUS

PDF

88.9 KB Created: 2021-06-28 21:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2911d8b6605224f4108e1ef389ac3a37 SHA-1: b5aed2ef7e8db28b18618797d3470ccac30d93b8 SHA-256: 814c7bcaba5faeef406f854a8762d89dd4c274abf0fd9e7160a2ca5f0ced3497
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The presence of these links strongly implies a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://atraba-holding.com/userfiles/file/25530750880.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609890a6a72f9---donedovaxomel.pdf
    • http://swaminarayangm.org/userfiles/file/kamavebufiw.pdf
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/16913280521.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a82ae9182---75590604346.pdf
    • https://rimsball.com/ckfinder/userfiles/files/50356246150.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087da2bee725---xulapalolesusebiditufeje.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/h7pqd3kksng8ai0oul6j9ji254/livitol.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/aq9q0vttj3dhrq9ir7l83680vb/32886462130.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cae7104e0---bujezufud.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/800d76cd8678651ee9e21bbbe4392a5e/mafizejufajunojuj.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1e968e0ea---totejolideb.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/jlnmrf3p4454q5j0181ril73u0/vesalamedoruvalizik.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae1db077e---gogora.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/81cb7eb9bb77de61c228dfae0bbab6ff/72489640732.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804a9794440---26424326276.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e514f1d4---11614839286.pdf
    • https://alnahamgroup.com/userfiles/file/nukaruwovepofeboluvo.pdf
    • https://dacinsara.ro/fckfiles/file/mapekekomonipup.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085102758548---pabuvige.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d66828ef91da963e4451e840b8b5ed0/siwivagoruranuviwakipibu.pdf
    • http://allaboutdowney.com/userimages/77897120603.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/63b44eafd687947c5c6d18f8eaf0d92c/vuzenokinubemezijopivoxo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=teacup+yorkie+puppies+for+sale+in+kentucky
    • 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_off0000f567.bin
3a8719e1c6ce441d1e4dde014521097b6029f0e604c23ec03c35e6eb06db47e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 10744 bytes
font_01_sfnt_off00010e49.bin
e0d727f1f6a0f9a0eb11cc5ab9020a43fe83f701104462695d8c6b83540a5e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E49 18208 bytes
font_02_sfnt_off00013e4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E4D 16792 bytes

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