Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cea6e0370dbffa…

MALICIOUS

PDF

90.7 KB Created: 2021-06-26 21:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 056c6f5dd3a2b0b49ef4937083d496d2 SHA-1: d4abf8d69da92712ba0c8d595627d4839a4f2752 SHA-256: 71cea6e0370dbffa4d1354fd5ded429ed3360510cfc0febd365ac6d9f26fe1df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. The document contains a link farm pointing to compromised WordPress sites, likely intended to host and distribute further malicious payloads. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics suggests a deliberate effort to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/7mkq6u5ln728lomt1a098dbhpv/16846691625.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608638b97a09d---93411600137.pdf
    • http://alnoorcity.com/userfiles/file/gunadidedevadad.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bfc69ae0aca302cd027b11aca836f6cd/33077802811.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160aba653c6130---199138017.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/51641576492.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5fc6c496---kemirinakefewusefudiv.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/92bmrhojlj5cb400jjprq92ed2/90488380235.pdf
    • https://alshamiltrading.com/alshamilfiles/file/51844949608.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gnnkfmvilkf2ksqa6npam3kvob/vafewewakejezoxafe.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d07d7cf0758e3a1c5628325254b480d2/64976497792.pdf
    • http://automotiveenergy.cz/userfiles/file/87381970063.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c40968ee2f0---8032229410.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e08c4acb37fec2e77337b34c64ece9f/46978827089.pdf
    • http://catherine-massage.com/ckfinder/userfiles/files/pigumafif.pdf
    • http://oreade-breche.fr/userfiles/file/27811780512.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/e031a979f597ca5fc95407014a7650dd/17476464005.pdf
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160a34d30b4151---35869312937.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5c5fc3f3b---71474683409.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada896c523---jugiwimefazeresemuwelu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16082983dc9e3f---fedenisi.pdf
    • https://advance-pack.com/editor_upload/file/kosepisid.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/fowopazerogodawisegis.pdf
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/resuselegujijobuduza.pdf
    • http://atrsara.ir/resource/files/ziletagoveluzo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fifa+14+android+game+download+apk+obb
    • 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_off0000f23c.bin
d664bf258e0f15b027517fb5bccdd58517cd8ea423d66a961992126d4861da4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 27944 bytes
font_01_sfnt_off00012a9c.bin
2fe1dc0f624897eed93ba9892ecf106880f6095ab33b387f95f9471fc991f46b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9C 11000 bytes
font_02_sfnt_off000143c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x143C0 16792 bytes