Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3ce42bad428966…

MALICIOUS

PDF

86.2 KB Created: 2021-07-09 15:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42c089c7281e320b178efa09095ab915 SHA-1: ad06f43a8e5e4504859ae2ec72db26c96dac467e SHA-256: cb3ce42bad428966972252b0f06447565ab0cb65b1c1548a1319f1bd0c0f263c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://zonazero.es/userfiles/file/54649610677.pdf
    • https://shellserva.nl/docs/Image/file/xijupatipi.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ffee1k8c52a5680q2bb5nrdbrm/memajuditotemukoritepigob.pdf
    • https://grandplaza.bg/uploads/assets/file/senepoxojoxogufuku.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609025c67f3ec---31010295265.pdf
    • http://massimomoroni.it/userfiles/files/jijiwubox.pdf
    • http://rbtyutj01.com/userfiles/files/tebowifasepamipebutu.pdf
    • https://bestcoloringpages.com/userfiles/file/52884907681.pdf
    • http://infoegrafica.com/userfiles/files/72587521919.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1335bfe6---xikefenalugimo.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/aa27936bd80a6d7ad102855ce31c2d6d/dexigopavarifito.pdf
    • http://ecohost.ru/pics/images/file/vavodigomumanid.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/6acf30ef0505d1747ea98c67daa9365c/jekibenijazopi.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6ddd8f4d588cb04ca9987b3171cb1031/87521701682.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/3c9949c05a5cb77157fef32115ce57a8/75403695477.pdf
    • http://intergeored.com/upload/File/17718855255.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160851e3cb2772---vozisalozegimotuweniwosex.pdf
    • https://bazab.ru/ckfinder/userfiles/files/42204264547.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6ff3bcc0a2f6f424c6465938ac46a3e8/61399467176.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14a2c7629---wegotopewevumuna.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/4dae2ee40b34860751f1ffaac9a98dee/78095837977.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=deadly+pandemics+in+history
    • 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_off0000ecf1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xECF1 16792 bytes
font_01_sfnt_off00010503.bin
b816541a693255087b4227d76f6ebdbdd9cec649c3a5ba6ecc63084c6b85d311
pdf-font-stream PDF embedded font (sfnt) at offset 0x10503 17476 bytes
font_02_sfnt_off00013302.bin
ba575e4a7cfc61f08ff8a1cd55fc912efcffc8b50acbe07585b13a4f3d89d2b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13302 10896 bytes