Malicious PDF — malware analysis report

Static analysis result for SHA-256 48f78e98b1188ee9…

MALICIOUS

PDF

99.3 KB Created: 2021-05-23 21:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b885fb0b04072d72cef2ab400b3d39dd SHA-1: 20a47ef4aed76e279063181d38c19d89b6a4251c SHA-256: 48f78e98b1188ee9c15b00061e07669278c44509d7f527c635462feaccc39de3
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, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9735

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://infrive.ru/uplcv?utm_term=why+does+the+starch+solution+work
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/18395a194d87518053886657d76c5a2e/vuguzex.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ff17b55f4---39488993051.pdf
    • http://ampletrekking.com/userfiles/file/galodu.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/85b8cce8e347b4c8e9ede7ec02e6101f/31044539962.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a042ec4f---zalowuxilunalufa.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c47a09dc8b---7803745054.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072badb37b1c---kutabibezef.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/2g99a74urlgtk6q5pfomkh4p5j/fisosaraxegukivofer.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/b6c2f4e6ae13ffcddfb15c1e6113c99f/kavatibubokok.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/99e122f3769b378a531dc47f22d9142f/61688933200.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608028b301b2c---50054137366.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/7bf83add71b70a40bc6454ef35080b2c/69920182603.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4b7n5rni0defq6tinjhofu34f8/nuzuliwewivutafisadixuder.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/j4oalla7n7h7eu6a080lq49i0q/xutinuva.pdf
    • http://amon-syotengai.com/userfiles/file/jugufopijumumewip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000178ca.bin
2ae897ef8a71ecfec7ce9d42f259d641617aa150b6b7bfd958f22812f0169b86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178CA 5180 bytes

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