Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff94961ce39d1db3…

MALICIOUS

PDF

83.7 KB Created: 2021-07-07 04:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8708bba06493b951a747152fdf2bf3a6 SHA-1: 0b68f5da55afef709ec3d1dab83b07009f06bf05 SHA-256: ff94961ce39d1db337b7caf8b94338fcf51d706cfaaf760ed534d50feafe515a
156 Risk Score

Malware Insights

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

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, embedding numerous URLs that point to compromised WordPress sites, likely serving as a distribution point for phishing or further malware. The presence of multiple external URIs and link farm heuristics strongly suggests a social engineering or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/uplcv?utm_term=action+oriented+performance+review+phrases PDF link annotation
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/0d7a289eb8b1b6d8050d533e8f2896fb/95637517164.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/381a1e8e9b1371645da7f3488408e6c4/16458568054.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/tirekalomalu.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba49e662422---97823980870.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/d935a8583df349da0ad41620fa4ab520/30463686938.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609002bf735a7---40862806713.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3229906dc---32998120814.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607a657c55c73---80790096901.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/sivezolumibutukovifiwew.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86cc386eb0---2725817186.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cedb0b2ef49---85880726605.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/mavarizemabawuroki.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/298d4ad3807330436d286e0ea94b7484/juxogeda.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/15822491699.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/30698606153.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/52038888412.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ad39bfcd7---49553958029.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b37eeca1ab4---pozovunixipedadovotonurax.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/caef9e938c03ac432dbef03b88987705/kuzufawomamoli.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8dbc84551---wopifo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/tjnafblalbi57gvpr816o3r4en/51677442499.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608103f89dd4c---13434862594.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b6e83382---posulija.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_off0000e5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5EE 10972 bytes
SHA-256: 640380fbf2451af8c297639cc14c0a634b73f40359ef3fcccf2ee78f361d0b73
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 16232 bytes
SHA-256: 2b4dfb95a6658cd85f680bc16b3daaa4f74f99408fa76874e1557572666b2a66

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