Malicious PDF — malware analysis report

Static analysis result for SHA-256 f322aaaa36b2f538…

MALICIOUS

PDF

69.9 KB Created: 2021-07-16 09:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f652c5e406691e0d533290811ee90dd1 SHA-1: 5a77df1a26ed9ce870d7d5f2e5ee7c81ecfc95eb SHA-256: f322aaaa36b2f538cb8950bf05f726443c1ba2577a87ba3db385b5a20af535a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7429

Heuristics 5

  • 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
  • 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://drafthe.ru/uplcv?utm_term=how+is+everything+going+answer
    • https://sgcaregiver.org/contents/files/kuwivotidokefupadosemo.pdf
    • http://fisioterapiasuzzara.it/userfiles/files/ratatetilegigidujupuga.pdf
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/07d6853a8d8eb124d3577436e25a726d/48434143611.pdf
    • http://botosani.ro/img/uploads/file/69452804240.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cdab5a92a74c915c118b414da7f75149/jijadiwikisudo.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/tizesutulufowononugi.pdf
    • https://tecnibat.net/uploads/archivos/jonewagenafu.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d7840b345---solivofenozixavo.pdf
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160709781d5ee9---68747752757.pdf
    • http://agro-pasz.pl/ckfinder/userfiles/files/zedikape.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08606d87c---23836862193.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d59d3202cc4---fukemowa.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5937044c3d---57694065239.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34ee7ea231---10302473677.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/totameruwazegoduferulof.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c4d4c01d6---jopenuduwijalajusajaba.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185c03ec12---mukegokowefedusumevosod.pdf
    • https://aslimitada.com/userfiles/file/kukavebaxijeturedeso.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/cfc61bb8c142d039e4b25151b617e7d7/kesanidiv.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf503e1c062---31216349452.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607946531645e---mojozaxudilanugimowur.pdf
    • http://funperm.ru/content/file/tobuv.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed61.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED61 16792 bytes

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