Malicious PDF — malware analysis report

Static analysis result for SHA-256 34535364336b6b96…

MALICIOUS

PDF

81.9 KB Created: 2021-06-26 08:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4a9d1851f4133bb6d38310b222e48a12 SHA-1: afe3e41fef7efd6c8d3be6594ddb7334c73ddd81 SHA-256: 34535364336b6b963d55f260ed6b6418c81aa903b964d601e24c4ef0313355af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous external links align with techniques used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35884f5fb---lodisupamenexomekomexejix.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f12d28b5a---64416964749.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609103cf04aa2---48028093402.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/a9raps48fkooh3046hk6s5dnik/69362092122.pdf
    • http://timebymtm.com/upload/files/30911292887.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ee4c9162a---kaselejitexenageroketa.pdf
    • http://baaningdoi.com/file_media/file_image/file/temotirajetilajizebumaja.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608457882c59c---30720541935.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8b22e0f8---42527555739.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/9oomvhgpk50goq88qs1lbcvh51/2075579404.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8417008aea69ab6889935cdbb932510f/zadogadigomivone.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd0ce0881---60051666547.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/wafezum.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/xusozefutuzabenaw.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/jdtmqe2plm46ss28585rsnble2/fewosiwurov.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a86e28612610f0ad06956d501b1492f2/letimerigowob.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702726dd01e---62468534076.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160949e693feb6---51659628370.pdf
    • http://exlluprimebrochure.com/ckupload/files/27331721028.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2efdae0c7---jodimovujerasezer.pdf
    • http://cuatro-pr.org/sites/default/files/file/ramolutusozofuxuza.pdf
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073bc066ea74---sesaxigupefixigabi.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/ec7f4708252967ea281254a0e26fae06/88815605422.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3523e565229d41560519fde727763a19/tujem.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608050dd98458---30564118712.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=best+free+site+to+download+pc+games
    • 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_off0000dc94.bin
98fd5fb89c6f6a81082812a56109eea6a25f16ccfc5629ba624e2aa42bdb447d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16880 bytes
font_01_sfnt_off0001085b.bin
33e12835ce97f2f3a7945e2e135b0e4800a4504f781e8f19790d7f7caa648bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1085B 11100 bytes
font_02_sfnt_off0001221f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1221F 16792 bytes

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