Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ed13944b50612a…

MALICIOUS

PDF

79.0 KB Created: 2021-05-06 11:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbd99c374017a1173d88532bc7ec3e1c SHA-1: 0341eb086c84525b9c772c51a5cc2deea007f953 SHA-256: b9ed13944b50612ae8e6dc5cecc2b9e1763afe1a0ae0a0495350f775aab226dc
94 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to redirect users to potentially malicious content or phishing sites. While no scripts were directly extracted, the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9053

Heuristics 4

  • 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://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/aivah55292hscfgrn3tod6qhbe/36962733134.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074793d00536---detosuxusa.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/28ec9715358bfd0edeb219453e7bb627/9763204655.pdf
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3bb7b52f0---98771203780.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082909c221ab---77336585507.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3a8affac---21197347270.pdf
    • http://akinmedikal.com/uploads/file/sawikafezuxu.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29a6f4097---pewoj.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ml6t865mle0a6n3e48oft1eo94/dejabotunowumufuxove.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc88e304d5---22615689219.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/57c11bf316f3745f3ac0043acb7d1942/72064858580.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608127621093d---gufofob.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071ffe3eb3ab---mekusafamamenefefodigaved.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b620de8bd---wezabinijafixubomutim.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1608b802cd0e60---bimegafonowuxiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=making+good+decisions+worksheet
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd76.bin
379b13d8a3536b30cec99445314934183a72b7a6ea8ce4b092df6ddfc681216c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD76 5328 bytes
font_01_sfnt_off00010fb0.bin
1df129f94be64e5b81028f696944b61083307112b6a1eee8e19b5c8ed983e7e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 11272 bytes

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