Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f04c028951d66b…

MALICIOUS

PDF

92.7 KB Created: 2021-06-25 22:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1af828566006ac86b647f8507b301951 SHA-1: 73331e8c95a176eea888e5f6797e5426cf7df888 SHA-256: 07f04c028951d66bbe2d6a70da8720bab3269d236ec22f9acae840d385bdf077
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing pages or download further malware. The presence of numerous external URIs and a link farm heuristic supports this conclusion.

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 http://podlahypilat.cz/admin/file/vabudobenirew.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160918e74309b6---33999607822.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/tu69dgmuo14hp5te2ha1rdhj0i/84117635182.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/a08k335sq0n41srsomv77a8qts/lekoridoxarirexuzivatos.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5868b638a6f009f929ace2a555dfbaec/1060972800.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/60799910384.pdf
    • http://biolabsrl.org/userfiles/files/vunonu.pdf
    • http://roland-toys.eu/userfiles/file/73908294382.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd2529ac0---12708808696.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/cfcf70b7a01a8c0a67997e96e16654b4/65523583155.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2dabe3610---tetenibaj.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d8fdb46049e01085ce6f0a82db8bfaf4/vutetotasubexiro.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a3917b730fc---94114074849.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160879106a82ee---bomigoziwe.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740a352f4f9---gesusubuwovidizozem.pdf
    • https://tolgyesvolgy.hu/userfiles/file/dotenizitonugakuv.pdf
    • https://khangle.vn/uploads/images/files/pifat.pdf
    • http://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/zetetujapirotokujeluv.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30ba2bfeb---51191885686.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160794f053a93a---patis.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac12480d794---gevudimobalawil.pdf
    • http://slp70.com/clients/873855/File/34316421755.pdf
    • http://ahdongjiu.com/upload_fck/file/2021-5-18/20210518004137876275.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/ce1285e8717fcdfa9ad8d3eb5e436029/77124974952.pdf
    • https://landbondcorten.com/attachment/file/b7ab2024bccbbd628be4a3124e0f25ab.pdf
    • https://aluminiosarla.com/userfiles_arla/files/jexuxabe.pdf
    • http://dailyliving.nl/ckfinder/userfiles/files/27532988050.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f465ea42dc---momapotijodaxuduwufig.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=troilus+and+criseyde+chaucer+pdf
    • 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_off00010640.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10640 16792 bytes
font_01_sfnt_off00011e52.bin
b7f135ea15b8a5c9b40b83ae52ce3d9bbe153e26439fed839505ce6c64fcd07f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E52 17040 bytes
font_02_sfnt_off00014ac3.bin
e7abdc03178dde51941199bfb4cd85e10ba5b525f7fc44334026b7b362c23727		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC3 10796 bytes

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