Malicious PDF — malware analysis report

Static analysis result for SHA-256 c363d699eaf5c8a8…

MALICIOUS

PDF

97.1 KB Created: 2021-09-03 00:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f5ef954ad56df8c4a93c1f83440bb248 SHA-1: 2001f64a45d77a9154ba6c44ed671bfc87fe5a31 SHA-256: c363d699eaf5c8a84ff52bee452bb92a2d1fd8328ac96f0be692fb24323e94b3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8324

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 https://wastran.ru/uplcv?utm_term=subramanya+stotram+in+telugu+pdf+download PDF link annotation
    • http://nuestratierrapremios.com/campannas/file/sesutefupufofixeleza.pdfIn PDF document text
    • http://heureka-cz.eu/files/46737157801.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/90206771850.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/70727702245.pdfIn PDF document text
    • https://bloc-immo.com/images/42580872236.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/7074e40530812ddd680d7e6d764a2f75/wuwek.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/db536fc1b42b29a3abeb52552801162b/93069171217.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/124ab399153155c254e7721d40bdd7d0/67533248213.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2ce407d00---65013508499.pdfIn PDF document text
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/83586057708.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4c1386d2---83105584040.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/4c14813497c9aa6ab91d1a8bbe53accc/dagajovunorebifelogepevo.pdfIn PDF document text
    • http://atya.eu/files/file/23061839341.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/xiponipexumosewojozitot.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/49908670633.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/60325811312.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210722_63F0EBE7FD5148ED.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/tadovukivemifukavit.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a645b3a48c1---jirefivafod.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l2jjsp3q5q5lv6pq0b98d4tack/96568197481.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210723024206.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a9abb3f5d17169b9e82af3df7ae54b3d/56058876340.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/60050572473.pdfIn PDF document text

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