Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4db321be608592…

MALICIOUS

PDF

79.8 KB Created: 2021-08-18 19:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a314de5bd0649f5194f76db5ad2417b SHA-1: 203437ade1aec633c8622b9397a131507f73a38e SHA-256: 7e4db321be608592365cda1a33c82f46273912b4834b2ffebd9a1664bf1aaca5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://krisoc.ru/uplcv?utm_term=how+to+calculate+bond+duration
    • http://tuclubcr.com/campannas/file/5777917880.pdf
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/83918348000.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c8768e074---30809395773.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/82897a5eusbofc7bggg1gd8di0/50284451517.pdf
    • https://nutricount.cz/UserFiles/File/28910636615.pdf
    • http://beastyenergy.com/userfiles/file/kadikesuk.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/kuterutolagofut.pdf
    • http://villa-carlshorst.de/sites/default/files/file/81127046548.pdf
    • http://www.wiz-fac.com/uploadImg/file/fufavedoreludufufejiv.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/2ebe640dc7bbfb50d10dbfef878e4590/88906750265.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lspn5jntk1s567idrd3g9b9fo1/1409623017.pdf
    • https://alutat.com/data/file/4616017193.pdf
    • http://sooam.com/files/fckeditor/file/1667397017611728f4463b7.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/xosovalowoxafefagoxoda.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e9310988fee---34428796623.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/13rhg2m8dpehdbuvjrm1pib564/23443708254.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b007745af29---ponebogamezuwelefagunibas.pdf
    • http://soupworld.de/upload/file/30826379883.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/7a91f465096bc6c38a495a5e6f5e69d2/60211782550.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968649cf7d5---memujijasexalufuza.pdf
    • http://innovad-ltd.com/userfiles/file/69583423939.pdf
    • http://maility.pl_adresuserfiles/file/fesofote.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_off0000d405.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD405 16792 bytes
font_01_sfnt_off0000ec1c.bin
e934aa0a0216664580e78df10085a99971602087759c4b7d7187e4b57f9020ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 10512 bytes
font_02_sfnt_off0001041a.bin
894cf2042ce04f3144841c197a530b621b072a8defba6cde28be68e92aea2b6a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 17356 bytes