Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5fc3c0da66658a…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 13:49:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebb8474c9ee68658a24c93c3a170543f SHA-1: fc5b743959a1021b580e87944954f66fd1531ca4 SHA-256: 4a5fc3c0da66658a7d56a8b839c7d59c7e12e040c97d329486a7a8b0887d38c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting suggests an attempt to obscure the final destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://gotoko.com/cmsv2/upload/files/fusudelet.pdf
    • https://isabellepieman.com/userfiles/file/fulesojebizolujosojeli.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b935013347d---48468948191.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160d298b041dd1---zokalotot.pdf
    • http://aucoindeshalles.fr/menu/file/gomamubowapasivu.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a0f7abe05---najekurumikuzosipetizita.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16077e621ebd88---dokizupitajawedepukov.pdf
    • http://erdivigado.hu/userkepek/file/99101461081.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a3161e76---43309299713.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090aed2655b9---pugevixobulagekodolizi.pdf
    • http://trans-serwis.com/userfiles/file/gevimazot.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9da2ac3c61---75691813928.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/feaf4e3a963575dd63062c563d860bac/58951347142.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ea3d820c7---11530875909.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a57398ffe3---92055552914.pdf
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1299cba055459d545179dc30242485bd/tupajewukividoj.pdf
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b05e1bccef8---77174716558.pdf
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/verafitodanezofigotun.pdf
    • https://aawyx.com/sites/default/imageuser/file/nujagofovegituzumur.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7a539e22f8617f2955bfc6a2771f6084/66461257139.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab86737e64b---24425222406.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/1588a00b468021b4eafc90a188d475b3/sexuzeluxoz.pdf
    • http://ever0036.com/assets/uploads/ckedit/files/20210609122111.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+are+the+first+three+common+multiples+of+6+7+and+8
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/1103a8df6266cd91d84d72c9861ad9ad/30757919916.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_off0000f51d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51D 16792 bytes
font_01_sfnt_off00010d34.bin
600e6ff5d3cfbe36ce62262e0e0e1926124253e1a0e27427d42fdf22468f5187		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D34 11404 bytes
font_02_sfnt_off000127f9.bin
563be6e2ae76927de259af9e71ad15e1cf70cc5dd6b86e511b9f39201e1570b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 16336 bytes

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