Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f90907e12be3497…

MALICIOUS

PDF

71.5 KB Created: 2021-05-27 14:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0faed0575ee70406c633548fe01f69f5 SHA-1: 9c65d8a9e3b289b7220f2e35d0972d4f1b9ec770 SHA-256: 9f90907e12be3497e00f72dfeed2a4b48c94cddbe20bc67671908cc54a647212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, directing users to various compromised WordPress upload directories and other potentially malicious sites. The embedded URLs and the heuristic findings strongly suggest an intent to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/5625ab2666df40c7178dd14dfa904aa9/dofijuxegejogixet.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/00d6596282260f5e945d29cc8bba2994/widorilivasonenoverikul.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/460988460.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/45b34dfa78666961fe8756440713e05a/novedumawokivejagifetavep.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160917a88d4019---zerodil.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28213b1240---taxalakafufewudipolafatoz.pdf
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/ae1ee5be3dcfb16e14b5bb10a4e02c29/silekidabuximi.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/3f8997bc657f1bff9fdd58231881f566/29960806805.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b4a0bd6d5dec7fbd2839fc618be04246/36871655885.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9d01b5bbf---18576640705.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734c36b3a7e---gabosetoliruwa.pdf
    • http://yournamebadges.com/withyourdog/cms_uploads/file/45098070416.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/jucrliqnkla2mb7mtb7orupg6e/41080410146.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/1ac0f6d79a652788e6e835d429ec2e28/59753289405.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=is+60+cotton+40+polyester+soft
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddb9.bin
f3538a2583c59dae11c12bfd9ebf2194d5b6b9bc9d43c8b317cd9036bcaa7303		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB9 5224 bytes
font_01_sfnt_off0000efa3.bin
19d5705f1ace8bd32378ee10298fb3a34fbcee551e3ba05d614585e2c61404cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA3 10536 bytes

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