Malicious PDF — malware analysis report

Static analysis result for SHA-256 423817e0f32ba6e1…

MALICIOUS

PDF

118.8 KB Created: 2021-07-08 20:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ad2e74137cbb17419392b0de5b6a345 SHA-1: ee753ef2fada6430fb9dfcc28f611f732428bce2 SHA-256: 423817e0f32ba6e1f1131e5a8742d14b41ef4baa4028e31343c38e1414f5803e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress installations and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to external sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9794

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://laborke.ru/uplcv?utm_term=meaning+of+sensational+in+english
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a709e4bdc87---sajotegunamisi.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894a9c9d317---21191186216.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65ba0f7cc---kizekefep.pdf
    • https://vgi-vn.vn/app/webroot/img/files/notinavudak.pdf
    • http://www.ecvbrass.ch/user/web/file/zoguzadiferabapizoxab.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/orhq7bl983trl5l74cchseqtt8/diraxipunekomulowoser.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/348f6aa9c90d76f5d8ecb5a7c70bb340/31497854299.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608177a20306b---medato.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/5fht0ov0mvqsj2rfttjk438o6v/gudazegokijekodum.pdf
    • http://say-international.eu/userfiles/file/jukadozijuratobumuxiwako.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/bowazapamarox.pdf
    • https://aawyx.com/sites/default/imageuser/file/pesoreduzela.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/bd7bca5cca1b0bbe95537342a666e567/kivarawaxezopu.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7dcb2629e308d5680b932136cecda99a/julatixojulusemubugebidik.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b3b8dd4da---tuxiguwubukazuruwoxixufir.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a32588b8---28223882821.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6cbd0a5177---34900386665.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bb66f855---murokafuvezupudem.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/56fc78bc8a4da38d5050f77c53d14f1d/41576744848.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1c532d6193af432f3f18aaa3a2372ed7/wakajo.pdf
    • http://indianspringhomes.net/userfiles/files/84996230725.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/fo2rbrj8i3hblhhefnn4jr6au1/nunovorenalokojolato.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB14 16792 bytes
font_01_sfnt_off0001132b.bin
44673e0ecaf4987fee6efdf6c3dab997d26de6a45c2efa6d038ce38485b3284b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 10388 bytes
font_02_sfnt_off00012a98.bin
8af2db6cbccb7574d55ea72ffe1ed8a06209e98696a9f7465693428537382100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A98 28256 bytes
font_03_sfnt_off00015fdf.bin
d79dc82c48b6b6fa0f814c1f2dab920baffd13063374f94e08a8c0c4f75159e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FDF 31232 bytes
font_04_sfnt_off0001a79d.bin
ed50b9340bd01f8851740a0141b8c1e667cd28b61b148aa85f52654c1fa8607a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A79D 11352 bytes

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