Malicious PDF — malware analysis report

Static analysis result for SHA-256 d816d7ef7ced6948…

MALICIOUS

PDF

89.6 KB Created: 2021-09-02 07:48:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71613518b0a384034753ed090fa919c1 SHA-1: f07f208e1999fdd96ad80e302cc89829647e32e1 SHA-256: d816d7ef7ced69483a14abce50602160a1a8a992e80fe5550c21a3218be96fa9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm hosted on multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/539d0250b82a7f3d7412a900ff3eb7ea/jepabepojufokazit.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/d47784889a4804a5573e8777245521ce/39410481925.pdf
    • https://anukulagrotech.com/userfiles/file/xepebotimex.pdf
    • https://hongming-eco.com/userfiles/file/jogoxifuw.pdf
    • http://cowmoo.org/ckfinder/userfiles/files/luragoxosunoxitozoregovol.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c7baa84c0d---duzaboxitad.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcaa70ef6d---sololubawatokuwuwoxudako.pdf
    • http://barcabianca.eu/upload/file/nuvixebunimosobaran.pdf
    • http://www.schule.havonix.com/ckfinder/userfiles/files/nikoxunevafowapiwuwow.pdf
    • http://worthingtonpark101.com/userimages/99281962827.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/fdabb2dfc3e1fe77045dcb57e7cf3060/58239237613.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e0099973d9689760b557f09774382800/57379162097.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/767b0e56e62bc2f82ae3b0d810461016/52629742554.pdf
    • https://oxi-dental.ro/imagini_ws/18174345268.pdf
    • http://szyoujin.com/UploadFile/file/20210821054210820.pdf
    • http://eltprof.ru/userfiles/file/likizutu.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/cc9c521950349fb2b0ad7d64516057c6/7813580911.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/4c6c2f7dfbcd04d83ba2c433e0ccb0ac/mezegewumunurini.pdf
    • https://bestofbucerias.com/upload/file/loxowudol.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0396514cad91fd313c0b709515f727f8/gesufemovugigedonuk.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/mekirojumelurubomexan.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8a2e5a57---88144152015.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/bc8d8bcb219309b9873bd757e612d182/folovibavujed.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/4b919dba915671053467f5cf550a1295/rotobinunuxodazurolezil.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4402d6b01c---gokobesaxagibepujutamuzaw.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/14490d6f26ec3e683e4f4472905766af/wokubufon.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/jgdun2ksmkr45punj0hs7cs271/pidarinogolamuta.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gcf+of+7+and+9
    • 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_off0000f2f1.bin
2b01f239c8184a7cfe0905fccb09cf7bc8da19d3a14e415b5645030fb423052a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 21624 bytes
font_01_sfnt_off00012a7a.bin
070aec3ae1bb8c98e28196a3cf80ef19c10f82c8c479b8412e288497d2492575
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7A 10088 bytes
font_02_sfnt_off00014123.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14123 16792 bytes