Malicious PDF — malware analysis report

Static analysis result for SHA-256 c39ce28c03932a10…

MALICIOUS

PDF

86.0 KB Created: 2021-09-12 13:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 903c5e4b550993e6d2050ad36689b586 SHA-1: 0d30b5ce77930d1749b8c1e121f92eee3d6f04c2 SHA-256: c39ce28c03932a10b73e76cf89e2f3acb9a678ebb1c697915da967c3f3c910e8
164 Risk Score

Malware Insights

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or further malicious activity associated with the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://connectcontrol.net/files/userfiles/files/78250009673.pdf In PDF document text
    • http://topstec.com/d/files/49825447204.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367c4e7ad3c---jidokak.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/zepedoluximexin.pdfIn PDF document text
    • http://4bx.pl/public/file/95034364023.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/63304004382.pdfIn PDF document text
    • https://minjar.mebel18.com/uploads/files/fikefipabov.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/bukiwuzenu.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/nedanitodof.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/45980935230.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393a3d421bc---7475942579.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/zebabedepuguzedekux.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/31870628581.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613422aed03fb---fosumakuvuxe.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/falifukixumasikut.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jovekudodipak.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/95334378513.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/vamujedikutamepabenofag.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/politunumewatob.pdfIn PDF document text
    • http://calisnt.com/uploads/files/23618928773.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139082a36200---kigejadadixivomidategoj.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/mevelogakapoboxuruwupe.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0e55ce2bd---zivagurulabe.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/31892761125.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/59315425261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+get+free+uc+in+pubgPDF 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_off0000e9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D5 10596 bytes
SHA-256: 08143ed9b3d137c8c4e47b6d25c218412ad094d11b5d541f4d25882f4b4af8a0
font_01_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 18648 bytes
SHA-256: fe1235bf37599d95de1811325284793a7122614a346657940a8a060de256f65e
font_02_sfnt_off0001324d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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