Malicious PDF — malware analysis report

Static analysis result for SHA-256 40726193b05f83a2…

MALICIOUS

PDF

98.0 KB Created: 2021-06-28 14:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42f55b87566fb515df202dce7eee730d SHA-1: cf7fa0e6bb8c7e35f35794a6a237a5a6544ecc6b SHA-256: 40726193b05f83a24130f8a04e306ef8b5c86bcdac037100ba436c06654a9c96
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to compromised WordPress upload storage, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of compromised links and the 'Urgency/Deadline Lure' heuristic suggest the document is designed to trick the user into clicking through to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/33aa32bcac61b2f709e45b238b2e12ea/sununujuxefexa.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/38126d3b973f50dc94594209fd778b7d/36462982433.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0fea2d26d---memesa.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/c5257452a7d3fa888bc92d43392b968f/98289922004.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160847f926f278---42053383642.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/b90f55efffb1524a4f4eecde58e15e37/48482015161.pdf
    • http://casaledellasignora.it/userfiles/files/60433656011.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf2a4ec31---pinukojur.pdf
    • https://travelstore.tn/userfiles/file/fetebesizasetufulubabole.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b285cc0d88f---65729621371.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d1d44p0dqk8r4uad5bk20prsn/jeranizibejavidoruguxi.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0645e50b7e---miripetupuvisutat.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0737c2291b1bdeb4a31ffbc039e620d5/fediki.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b6244c47---pujazilebum.pdf
    • http://usmleworkout.com/files/file/46953213928.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/3bfd5fee2ed7086c6ccfa5362e922615/18833756911.pdf
    • http://www.odnpoznan.pl/fotki/file/file/99192729537.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d867defb24---86923959040.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078922844e51---xegubasogetowujodemu.pdf
    • http://arcomproltd.com/userfiles/file/kirug.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748046e174d---61101569673.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e125d024bc---daviwulakokurekozokirawa.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/futugetotobeboki.pdf
    • http://thaoduocquyhiem.com/userfiles/image/file/tuvewarebizetawab.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bea9e286c---47872924980.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=keflex+and+sinus+infection
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108af.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AF 16792 bytes
font_01_sfnt_off000120c1.bin
a98489661a3b9bab5284db10a30cda4a1a75665e550bc76f580c9581402edc7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120C1 16696 bytes
font_02_sfnt_off00014c24.bin
bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C24 16252 bytes
font_03_sfnt_off00016205.bin
f175f64d362337c71740d6de049f8d7927f6dac2a21da5cfe6111e6cc8da9ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16205 10564 bytes

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