Malicious PDF — malware analysis report

Static analysis result for SHA-256 8417fb6492406378…

MALICIOUS

PDF

85.3 KB Created: 2021-07-01 15:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 541324a3710603dd3d88efffd3979bf4 SHA-1: 2b2217ac2771866b22bd95de93bd0fd3595c20d2 SHA-256: 8417fb6492406378ec2aea08cd601b8124711c78da08171e10682c9110fd05a4
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and heuristic firings indicate it's intended to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://daming-school.com/userfiles/file/gewox.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2272cdf15f---25535268817.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/7247b69cb669a856957c5e249628e328/wipavusemitafujakuse.pdf
    • http://dijladentalcenter-qa.com/userfiles/file/gozelufibolebomafadipumer.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/d0t8gaoq4g3ec80lahd5ngaifg/zewubusutenut.pdf
    • http://dalboncostruzioni.it/userfiles/files/kebapawejozufunaj.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/737abc783bbf5f894665760a2e9e7bcc/mubepeziperurosi.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/25561916377.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zafulobanitovokigal.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/67017967104.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bf2fc0e254c194fff2f78156c47f2a47/72303688900.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/49c7a598f1fe633d757d297de5e38366/43164240235.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/24812781493.pdf
    • http://clubselectionvoyages.com/images/file/19837066765.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/f4db2307b387003f2be08680a33da810/73454308179.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a899ebec2c6---97842238277.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/06u7hr6nbc3ui2emgpsafppcl9/mazatazelusotumoxisugeg.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fc7cf025e---42115706412.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e43dcb26d4fe22c9c75b13b94961cd8c/xovepef.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9feca9bcfbd4f213b6a6c1be7dfdfe75/derexiwapixanowukevaf.pdf
    • http://manavpublicschool.org/manav/userfiles/file/kinoripuzi.pdf
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/88c4a7f4f893ed21b394bf941299d206/semoj.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b59864e8b0---23768857158.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d5d2508f9---witunozagorekibaxoris.pdf
    • http://jshtextile.com/UserFiles/file///kekekevadikonelosof.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4454eede23---97202724183.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=nuvision+7.85+tablet+manual
    • 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_off0000e76a.bin
7bc999191bd1fe0daffd001b93a5a3e9db8c80cdbc03b8c470a734df3c8dd21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 17920 bytes
font_01_sfnt_off00011658.bin
47171b82d344ed9b924e4d8fff8a60f411d303b4cac0a7241e5a924bf4bff17a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11658 10908 bytes
font_02_sfnt_off00012fbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 16792 bytes

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