Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4da686691063a9…

MALICIOUS

PDF

99.2 KB Created: 2021-05-12 13:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc1c2273eebf2f491b158c1abeefe77e SHA-1: a0701da137f5bd9a4b9865d57c2a472b3890573d SHA-256: ad4da686691063a91c9e195deb6d898b0ed8b3ce2ebd353d221b51375b54a696
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further indicate malicious intent. The embedded URLs and link farm structure are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8089

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=classic+human+anatomy+valerie+winslow+pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160840a010d256---mirufifepijiz.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077068034267---gotozijevifow.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bad24c7a7---jogegelip.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/c5055975062a1acec84473392f4915a1/65633996574.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609974fb0a141---65464004239.pdf
    • http://allycatering.com/userfiles/vufeximuv.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/ac1ff86617d2ad0252717f6ffe4112ca/majerejodabaferub.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jn69aqb8bfgee338g2onf46tqr/fowidedoranirejuxulo.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083eebc77177---kavapikerolesijuselizezaw.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/d9fc20b9833830bf7349ccfc6bdcf393/vigaluxes.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/11ud0l3gp5fdgdn4bf7e0sdgm9/weperubasovoral.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16094d6e129986---96368021521.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989a4f0ca67---48415995954.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b0c58b695dc8a69ffe54a5a4f0820151/tigerebakopumebut.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748032d9a95---lepatoropadusagukebegolaj.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d979c10d63---30035717582.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160988c7813788---jatetidewedesodixasikapi.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98cc1fd3f---14648192498.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e90.bin
c6b91c7d438fe889930f0f7f22c92e25e3143a181b0a9ab6e241daa576ee656b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16E90 5556 bytes

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