Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c94c145a94596cc…

MALICIOUS

PDF

76.2 KB Created: 2021-07-15 09:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 38d6d5fdf5fa8c7d4160a92e69ed4a6e SHA-1: e125ade21ef84f405a868d4f148098a4f652a62a SHA-256: 5c94c145a94596cc61771e1c97be60dc665bba3da79f91027e7f38421c009786
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pixomot.ru/uplcv?utm_term=react+bootstrap+table+server+side+pagination PDF link annotation
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1096a69c30---vevaf.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/ravumusexena.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bekipudijibedujozitope.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sudujurup.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kedusilufe.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/55287614761.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160de2b369bd49---guwux.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c61ec8ffb---mitulifemizesakub.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10602bc59a---mokutojup.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/pisupududalaxi.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/69816019691.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/13a86fa5e89541b2e60afe93df96e64a/kaxafesuwivaneruretolep.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/00321769687f963034626d3c31433f32/35517007174.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/25176879078.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/44726656259.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/87333bb6c05944781453a7c52ba4dff2/60879310702.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/4513ab2cf3327e234104fc6268c91365/83197755976.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/kodizetonotabuso.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ilr11f4a05k46teva88sjqk1s4/sivozetobitosigogulewik.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ed9f18ad3718569ddff5c37ceca8614c/63768229225.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bea29cee4---30257861044.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/fafeseb.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/3477348918.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/vigibodonewoto.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/jonuvipubezemojuwanog.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_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 17596 bytes
SHA-256: 52e5919a587d0c7b79a4e84c4d1114bd0b86c40bbaaedcde75f4d6dfb5eca904
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2A 10940 bytes
SHA-256: a3c0b48c7094974021d3ea17c12f7a17dd0f5fc55161b7f169e5868b9017c76a