Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f4fc0d30ee0ad8…

MALICIOUS

PDF

67.9 KB Created: 2021-08-28 18:52:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db17a29cab0bd5e74556fb6c60057d1f SHA-1: 258333f7a1e56de5cd64a129c94471f223be3c62 SHA-256: 36f4fc0d30ee0ad88d3280426b7cdc4b4a1aa1b8fd66804fb8bd0acbb555d45a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to compromised WordPress sites. This suggests an attempt to distribute malicious content or redirect users to phishing sites. The ClamAV detection and ML classifier further support its malicious nature. No scripts were extracted, limiting the ability to determine specific execution methods beyond the link farm's redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9342

Heuristics 5

  • 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
  • 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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tdh0e2rasjfideifo9vdddvc71/zikipo.pdf In PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/vfk7pnurlcs5268o9lgfvo1u02/sozafowule.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/80022176289.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778d5dcc4b---sumevo.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/17706816393.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/32e33262864962653708d1d765874bde/rerajitoner.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8b51eea1633d73c47d81b4b11594cb81/nerobuxevaj.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16111098d4c9c5---sazadadumaxani.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/14566316557.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/wuruxedi.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/76667809454.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c423fd6f24---pokiburi.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/50658462367.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a8cb46686147a286d606475ce40e9460/rafunedajudipuwikuniwuko.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160d422730b126---femudakabadebinowuk.pdfIn PDF document text
    • http://haphadoor.com/upload/files/sawozileludu.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/fafipaveteguf.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/44746185887.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/13925988108.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/pipotemeko.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/95850805253.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=muscle+and+bones+gizmo+answer+keyPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608439c57a0fb---56412078417.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 17228 bytes
SHA-256: 49132ecebbdba6cdb17341793a774dc08bf76e9c978196c0b8ff5de62e3e1dc5

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