Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6ec17ce0d10308…

MALICIOUS

PDF

91.0 KB Created: 2021-06-27 22:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24a478cc7b4859574d97327276cae82c SHA-1: 9a06335f927327e086660ad97659e411555e3b87 SHA-256: da6ec17ce0d10308a9ebe8725c719414b0b6733734eae21510344cbfeb6940c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for users to download further malicious content or submit sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=berle+e+means
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9635164ce1---81312349011.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5b296f7a---63673275961.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3037152f2---pumegutisapenabiv.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0ba10361a0095bd344dd43cd98a99bdb/69786910169.pdf
    • http://agapetown.net/ckfinder/userfiles/files/teverutufuvanugivenibilep.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/56i5ri6vovt0d88e3am0fqbqti/5672241587.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/a661c61d62c5150d4ff0e3fe1e3f3ac1/57212885544.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160797561e137b---momigesezifigozapoxapa.pdf
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/5ceee8729ff8751f624c70bec40f503e/78705815473.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c343c864---12005711800.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b53730b9f---8992488770.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/30bbdttvpob3honu2428pugup9/65748799017.pdf
    • http://akinmedical.com/uploads/file/jifagegiw.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e7968f114---73446123268.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ecd855286---65722534764.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5a715ps7kvk8tlp9iidg86hcgf/76552573612.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3dbe158a60---zogenigela.pdf
    • https://waroproject.com/file/5299079270.pdf
    • http://geoodwierty.pl/files/file/24942555125.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160ac06bd5c773---jixoweweperu.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/fisalodi.pdf
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/vabamotolipoputawuxeki.pdf
    • https://monyetmesum.com/contents//files/sanodedo.pdf
    • http://movementlab.dk/userfiles/file/ponezopugujaragorirajis.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/kagemupasusadegojamumog.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_off00010371.bin
436524b9a724fe09e2ffda09dc98045a4cc17e59fd4b8d3849d417fff2fe71e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 17384 bytes
font_01_sfnt_off000130cd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130CD 16792 bytes
font_02_sfnt_off000148e4.bin
28a153acccc4ff4514205341af3e0a6a0b3f2fead25da3e428cdf76201f3526c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x148E4 10012 bytes

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