Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ee36f51a03bc55…

MALICIOUS

PDF

103.8 KB Created: 2021-08-03 10:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ee1de1bfb06e32d800afe450bebe6d20 SHA-1: 8eb69d1c02f242a3f848ca915539726ca0b7d5c8 SHA-256: 65ee36f51a03bc55c29fbed8216fd07d31e4ab2dd0191919db0720cc0ab035f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://oniceh.ru/uplcv?utm_term=what+is+no+longer+canon+in+star+wars PDF link annotation
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607accae32d54---pinunef.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b99823e093e---76179027858.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/46667347266.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/cbf531ca1028560fd277ae631105647a/48242839824.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/t639msinfo6njit9l6pc8e73d0/tivolewigepukafepugifiweg.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0a0fec10a---14308242023.pdfIn PDF document text
    • https://cape-electronics.com/media/file/dogusabowumagoruzavido.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/52414567497.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1212eeb6e3---gegep.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096e5f1dff19---sinigulezato.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/poweroruli.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/2jcrq5mli25b10524slj53pvku/69564022093.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/temiminezifefasosat.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f1bead4c7037501c3770e08cbb196219/33321902020.pdfIn PDF document text
    • http://xn--aknmedikal-yub.com/uploads/file/jegevum.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/dewiwizun.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/61710938066.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/64069717172.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/605f1htfg0viilnc2ganu08b92/93282935434.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/218u9qpvsal2r9tr497llko6h6/458078479.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/59049971891.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/55343615574.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f3dd21372---76532685435.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607843af48d40---62179117890.pdfIn PDF document text
    • http://adveotec.com/img/file/giludekudijemugusuxe.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_off000130d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D1 10588 bytes
SHA-256: 0d1b4d6df829230fb3bc7b4f7b3b3063e1ebe0e9b595d5bb54075d73d6761473
font_01_sfnt_off00014909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14909 18140 bytes
SHA-256: 9b24a21578cba2e105f51cc4c96ad6c111a8312222b1a791611ea81462cbef22
font_02_sfnt_off000177f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1