Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3d8ddc3e9655c3…

MALICIOUS

PDF

64.0 KB Created: 2021-05-27 00:31:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0190f48d5679105bae5c32373d866ca SHA-1: d7a96b0fd55a07fa0c34a5e33db1160e9dbc0e8b SHA-256: cf3d8ddc3e9655c3f6d9017e51347e22d2805c3c7edb3750f6068421564d4769
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting sites, suggesting an attempt to distribute malicious content or phish users. The document body, though heavily obfuscated, contains keywords related to downloads, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8363

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://mynigaoe.com/upload/file/20210524203203.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ad15b4eb9---26611471610.pdf
    • http://abacusnancy.com/userfiles/file/3462793047.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/259eef07203587c67a2abbb809958900/jalazuteta.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abcc232db74---90449861161.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb80846760---35054295888.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073688eca9b1---56131917666.pdf
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/vutezeturupej.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/rgvemmpmk0mnnsciifgklpgbha/55280544906.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d6774be8---vidoponatujuxotenolifit.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5cd14a877---19186735835.pdf
    • http://gourmethousemacau.com/UploadFilesfile/%5C/kefulibakuganuvet.pdf
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/gafalivodokusifelilo.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160980e5f1721a---95507309949.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=prophet+shepherd+bushiri+books+download
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f065.bin
2f393d30a62472ff589e9b8c5a5697b5c8b0469f8d2b2d32e254a4a7de47f3a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 5344 bytes

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