Malicious PDF — malware analysis report

Static analysis result for SHA-256 a435be9c7b21e400…

MALICIOUS

PDF

87.8 KB Created: 2021-07-02 15:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83da79e4897e1953705eb6718e4ef0a5 SHA-1: 81bafbd0a9e93d9b6af41c617224fa2746720793 SHA-256: a435be9c7b21e400372c96ff372bf81ae7a17bf516fa983771ad795e3ad07c5a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery attempt.

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 https://crewmak.ru/uplcv?utm_term=subheadings+for+research+paper
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c656acff---pugodi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/htuffnh4aoos71dl60vsjb59r1/nitofudedarifora.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec6578045c---rulujasinijobimemub.pdf
    • http://thebellingerfamily.com/clients/0/05/05034faaa501c69409a7459485cba135/File/61145626020.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/64259974749.pdf
    • https://kodcomputers.ro/2664/uploads/wogobedaxoboxegivunavaku.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/6f4a61256b1e2bce3de5bd570986068e/petunezadefabatenoj.pdf
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/297a17621a31e0f756ba796e2fda3ee0/50521734767.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f128d8b1b---35515294611.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/rkmdg3bfooi09d3sr57fujllt2/72580168333.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9ee46edc7---salabodaxupowenup.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1bc4aa6e---gupurasabedowekodinawox.pdf
    • https://gencerenerji.com/resimler/files/gejidefuwezipives.pdf
    • http://newgrids.com/userfiles/file/73429057628.pdf
    • https://davaocarrental.com/images/file/98385357903.pdf
    • http://radio-salsa.com/php/rs/filesupload/file/86918624214.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bd649f4af44---66695412518.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094f639757ed---75858142938.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/aqm2o727999vpji1kcp9kv9ai7/xexupevugigodosidenopi.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aac775e5d---2436976711.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc4720839e---52498589781.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/d2ki1p592l0lpq6eaojkl8gqs7/lozerawenawuriwomox.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/vcslkhlgptuenfufsjnd3pqe36/rejupavibufipukuxebazes.pdf
    • http://fouladsazanco.com/Upload/file/fiwakigidakonesutikapides.pdf
    • http://architects-desk.com/uploadsfile/4584510410.pdf
    • 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_off0000f480.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF480 16792 bytes
font_01_sfnt_off00010c97.bin
2187eda4873ca81e9c1495a405b1b73565156d3fbfa108ea8227a3b5a593d276		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C97 11072 bytes
font_02_sfnt_off000125d5.bin
599a2b8486c9d18e3913d1bbbf9291bb6788fe4a4dfe3f162418dea4c2698947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125D5 17200 bytes

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