Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc5a7353a7824871…

MALICIOUS

PDF

87.4 KB Created: 2021-06-26 08:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfca0902c040d8b502991cf9988135c4 SHA-1: d4bb770c49e2c641f677bacc0c10f36696eebf1e SHA-256: cc5a7353a78248716ca889b2ee4d004641f9f27e8d4b0f5e6214b322dac75e2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://murito.fr/ckfinder/userfiles/files/6937567157.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076f03ac9fa9---18239395833.pdf
    • http://marcobernini.it/userfiles/files/9480666066.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/xejujamid.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607720fac764c---garujizunixawadaw.pdf
    • http://iziusb.com/userfiles//file/44635783151.pdf
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/vipusobegerugeve.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bda29905850---tarovixexirasorakexe.pdf
    • https://sindonis.com/userfiles/file/dubopu.pdf
    • http://artdealer.vn/upload/fckimagesfile/621d06c08cad8bb37e4b51d319ee629b.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f38b9e906---25851240173.pdf
    • https://srmhospitalities.com/images/bulk_images/files/sofogolakazexupuzuxazeriv.pdf
    • http://adamlegal.com/userfiles/file/wimafapigu.pdf
    • http://lab4050.com/upload/editor/file/4013233777.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa7d2bb2a---14213111687.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa7f3ea63e---diniguzegexuwa.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761a25c30c7---dofupetarujajifanenawur.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c62e878f7---30849315544.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/4ef766d0d8fd8eec3847d73ae6858344/zupefexew.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5be744425---45630849207.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed8b070d9c---wodubagasaxibimiluzewoku.pdf
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3b17988684cdd2863ad0646e252e8057/96723413575.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad0c309ef1---gefapaliwuwitidaredag.pdf
    • https://aduanaldelvalle.mx/userfiles/file/kowipiku.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607189ec433a6---68054178866.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=icd+10+code+for+neck+pain+and+stiffness
    • 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_off0000f42a.bin
5b986fb33a5a2bda37f25a0daf9f14ed3205c0449c848bc13a1ad08d10f114d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF42A 16716 bytes
font_01_sfnt_off00011ef2.bin
2ac5164e8ed25aa6de8c4d42a2f58efe41b46cad96a5cf4d4df7f9e7a484f748
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 10784 bytes
font_02_sfnt_off00013800.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13800 16792 bytes