Malicious PDF — malware analysis report

Static analysis result for SHA-256 266706db227de1cd…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 03:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f07343f0ef14f0f4d29f93d7bab4a379 SHA-1: 22a096f03b5bab6f3180ccf1ba9dfa05b31b63e2 SHA-256: 266706db227de1cdc73d52ea47d69d3c496c1b8982e8025d6142301d3b117c44
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://catamma.ru/uplcv?utm_term=pengumuman+seleksi+administrasi+cpns+kemendikbud+2018+pdf PDF link annotation
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a85f3a209---35427203600.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/379522abe303a54ae1b96d29a0f67c20/61483283936.pdfIn PDF document text
    • https://szamitogep-szerviz-javitas.hu/ckfinder/userfiles/files/95433281392.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/tamupajijirakowelu.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1a8d08660bdf93a3dc7fa592549739b1/zezutisefunivugule.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8889e5b05e5705aae9d6ccf3b0862eef/43833348655.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e92c018e---tepusekin.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/nigizimemuboferuzomaxoze.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113d86095c2d---52813616994.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/006aa25dcabb75cb770f1ac930f7f1f4/zunemixuwofoduzopizixu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-1/20210901030349559142.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/kijimeneximisotu.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b083293a6d7---vetopuxosamijol.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/34759674010.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/lo5pho40mfdshv35meslvu1p9j/xatit.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/getowuzudisetabezug.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/zitolirisu.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/miwanijozomut.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160791865636ab---76394342821.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/lafoxeveximufugot.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/26602499595.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n8lppe4m7k83pgis378fmstop1/18683806640.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 11680 bytes
SHA-256: 8358848468daf07969632e1f0e12e2e2e1305f2af6367c9cfca51a3b765afedc
font_01_sfnt_off0000f8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DA 17168 bytes
SHA-256: 775e3719bcd5c97dee2185ee7fab82875a82c5ba7125f2848c1f6b28c6f6ce49

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