Malicious PDF — malware analysis report

Static analysis result for SHA-256 0417b06a4f65d40f…

MALICIOUS

PDF

71.3 KB Created: 2021-05-23 09:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e56fa037fa75f8555e0bf9f7a923b94b SHA-1: 3ea5748ec0673b52ff94adb4aa7c07b7634da8c8 SHA-256: 0417b06a4f65d40f062ad5a2536b7ee946c3fba4e68daceaea486d8e910f8a4b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://aelma.com/sites/default/userfiles/file/tepudedinakalimesoxuvezug.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641137f8de---46353923808.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ba3102be53519d5297887f031c23bb5e/45304989334.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30c032b3f---debijiz.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08f32cf02---gijalekeradepe.pdf
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f63b9e714c---10077317707.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/f6706db05bc4f08b3cc6d15fb60c515b/66292665523.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607724e81ae65---sonovoz.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/5ada0eee6ce4320d55841a0d3b223aab/fazesaxifotibezudunix.pdf
    • http://asbu.net/uploads/FCK_files/file/xiwalutamedaxuk.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/p66jea2kek3q6tq1lgniihrb56/73198205872.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84406d17f4---32649897021.pdf
    • http://pc75.net/upfiles/file/1621380600.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/dadfe15badb0e67f9d36ca1575c05189/78121383657.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+set+armitron+wr330+to+military+time
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d81b.bin
aacb5adae54f7667b562646e995cad390ca9ba30f7e5d83285579b7042b5ebf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 5292 bytes
font_01_sfnt_off0000ea0f.bin
3db0e4c7a038f7003b0e16d231265402d6bc46619747ea1b80a87a9ab9a36a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0F 11024 bytes

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