Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e51696836b40141…

MALICIOUS

PDF

83.6 KB Created: 2021-08-17 20:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f83937baa8757071e9ee6c0c8ec14c96 SHA-1: 7f392bf4a13230d89d03b6d267ae9284a45ab79e SHA-256: 5e51696836b40141bfb403b47ad20e3b4ed5cd8b324e32d5d0232cea0ac69ee1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for potentially deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vamaconsulting.sk/userfiles/file/71013160161.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fcda48986---62000842285.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/wosufunigaz.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vi4phhn7fj812qujpvhcrm2648/gajidoreju.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16094a56c0f36b---7087357549.pdf
    • http://angeladaniel.de/uploads/files/82393361942.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b153c8a9ccc---14002238557.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/93617253806.pdf
    • http://pvvc.cz/files/28710284491.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160705d5e33ba0---34412480314.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca4b82027e---kojozisev.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf2c8de34---96432642834.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/f531764f46676cfe4004b2609e0b0287/26952306713.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/5fca84fb6a87178e7fdc3d4b0f95986c/botideguniviz.pdf
    • http://ruihuitax.com/files/file/76904538011.pdf
    • http://thekitchendesignstudio.org/uploads/files/mawobiduxinezimosid.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c3afe637bcadbb78d68ce4d9f8b563ea/82672636918.pdf
    • http://vvk-wiedermann.at/userfiles/file/61760528713.pdf
    • https://ritascreation.com/userfiles/file/wurem.pdf
    • http://pwr-tech.ru/userfiles/file/vidovesulukubijijil.pdf
    • http://emanuelarombiarchitetto.eu/userfiles/files/jixotofid.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/7165ec68cd5b970d31d8ace86a3e06e4/98426877608.pdf
    • https://nazragame.com/calisma2/files/uploads/13987898659.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706a57a1d44---zinizejumudiregevarupareb.pdf
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/91698717616.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fidic+red+book+2018+pdf+free+download
    • 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_off0000e0ff.bin
906c3087fc8bd4925ccbf4cec7a3def4c6b7972847128cee876e46bb94908fc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 17248 bytes
font_01_sfnt_off00010dfa.bin
fb88e733488c3b6e84a175333a6658bdd570e20d38446fafa8ef6b6e6a8fd265
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 11144 bytes
font_02_sfnt_off00012800.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 16792 bytes