Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b1aeddfb523134…

MALICIOUS

PDF

95.3 KB Created: 2021-07-19 12:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2249df37c25cd251c86db11c31799871 SHA-1: a196879b83164c1761c75efc41a1ae7e993b9508 SHA-256: 84b1aeddfb523134c1f1fd4be4e011366e64fb363ad065cb75df446276c40133
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://saharun.org/uploads/ckfinder/userfiles/files/22107621636.pdf
    • http://diegogenna.it/userfiles/files/ruxilar.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/97a7a552c2fc5725ed52baaf3479de3c/tojizisumeketapomulobe.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a7ef9f5cf481d485ad0faba3f9580c1f/63861747800.pdf
    • https://smartcrm.cloud/upload/files/zogamu.pdf
    • http://slsnn.ru/content/files/zukulikukugigu.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160821af2b2cf0---najakovijojotipuwodifa.pdf
    • http://hanasushichoice.com/uploads/files/17204359828.pdf
    • http://asiadomainstore.com/userfiles/file/laketajesorefuxawapo.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b52a25812---nebuzabojitavalonibiribo.pdf
    • https://www.avantagesapp.com/uploads/files/zasokixudolovet.pdf
    • http://caratow.eu/userfiles/file/xuxebab.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607443de59517---7479236185.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609474b7dd6bc---falodirosala.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160efd49b8c93f---90685801111.pdf
    • http://turinhotelcompany.com/userfiles/files/78024847674.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a326e5b3d0---ligokolito.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9117009e7---zufudasonuzatezi.pdf
    • http://agriturismolionsfarm.it/userfiles/files/1412573044.pdf
    • http://ajarnveerapong.com/UserFiles/file/bimugor.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/1421ca22d14a2df2a4b64eed365917f6/75148371581.pdf
    • https://buka.ru/sadm_files/vifula.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608508489313c---tutanapejud.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f3490f62a5ddab6a12fc796ec227332e/90824192005.pdf
    • http://zuestag.ch/userfiles/files/zikoluwasoburafirorolipe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=life+is+hot+in+cracktown+full+movie+online
    • 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_off0001104b.bin
1f859ae071f5cef4e9716c32484359876ae3d3ab3e594c42cbc7c7f01dc7cc26
pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 17064 bytes
font_01_sfnt_off00013c9c.bin
944b4475f53b761b9c76fba6ab092bec57c163edd4e647e087441d2df5d7e6c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9C 10904 bytes
font_02_sfnt_off000155ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155BA 16792 bytes