Malicious PDF — malware analysis report

Static analysis result for SHA-256 246a461cb9d783ac…

MALICIOUS

PDF

89.8 KB Created: 2021-08-07 09:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70a8e6d73aee20ff79aea9c583e426e1 SHA-1: b5deff6db7ac7422590c6cde8c304dbe5bdade2b SHA-256: 246a461cb9d783ac5b3d82074031d53673793770550b78145801d55d7891aa9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous compromised CMS upload directories and disposable domains, a common tactic for SEO spam or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to exploiting PDF vulnerabilities to redirect users. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://aartipalette.com/userfiles/file/kudajuxufukenuxazorirax.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/23b8ee52f6f8f856b1ab3603cb0452c4/teretoxagedavopinat.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/soaia4rujp2go703kfeqq3oc0v/fiwunedewine.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/33676462727.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a6a5c735924fa37dcd7d27d2fd080130/naselobolasuvovunewuwe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/461fb7fecdd79be447ab5b2566cff9d3/nijitenukobudolijovizupo.pdfIn PDF document text
    • http://cobmedia.hu/include/98438439742.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef09d8eee---vudetunevawebelumivi.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/fasinupa.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160acb01068ba5---44730130668.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ba740c59826---bedabefirelakapalu.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de27a576c7---nisopopamidutemazodo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc9487238---vikajopilolulawuwi.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/82923674628.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/ubt0iqssl3934127hh1a5vssud/46816508406.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/32b95ab1aa228e733c7938da97b91bb9/31684965392.pdfIn PDF document text
    • https://digireg.cz/upload/virawubesukoxot.pdfIn PDF document text
    • http://temple.mo/userfiles/file/pikixenudipifobojoxux.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6fe1d914e---tejijavawevanuzijerajo.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/kmhmda4bsl9bmu37vun0g7nn01/dilututowapetejeponid.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/71728925276.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb07db3fab8---58545429474.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/sixoribalofasugijodevoxo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/05d04ca86ed6fa12196b426faa7faf53/18449421033.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/toropidudumer.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/8918683879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=assistir+filme+online+comer+rezar+e+amar+dublado+youtubePDF link annotation
    • 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_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 20904 bytes
SHA-256: 82a53a7dbf3450e6d66472283c622cb6f492810778d9523b093098f70427a697
font_01_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBB 11032 bytes
SHA-256: dbd4f32da546d38cba0571e11e35622d6918da1910ac7bfc493d3b696cdef16c

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