Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f34a1f0266a660d…

MALICIOUS

PDF

57.7 KB Created: 2021-04-30 13:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47cef1c069dea54aa75c1f06283c7f98 SHA-1: 8d7da7f5f9469d8e09c3a4051f1873b74fd15c63 SHA-256: 2f34a1f0266a660d06508378583660c7850c46b8d5db23884ab1f9347ddc0f2d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8214

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607962fb4b54d---44115541114.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16086801b726f8---xorukafem.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7f6b2281a---30646775782.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/288a5d7c81a6a0e3f93933e655d5ab98/tenikagagowez.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16083a989865b1---46784095032.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/8c8a101842977da71ebdb5b7c2420b48/lepukemubipumijaw.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/dff0018683c62230946cd73877650e40/86214282765.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/32faa880fb1918a26dd542f2677e44fa/35921915229.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d28067d342---14211256943.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/e78bb4ada1e47b9a03aa3bafe040142d/libimaluwotagudazidob.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/8a2302d822a541a51903fd2d378439e8/kuzuvubofek.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8ac99913b---kipoz.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/30fb871c52458aacf18b8e827f468cf4/tofuserosizurabala.pdf
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0dd7eba---46614417067.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab85c8ed97---72378061641.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862e8e49694---20746485381.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fawkes+the+phoenix+piano+sheet
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf4d.bin
66062477deae017e85c8b57f71a61555d63472066070629ed321928afc345615		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF4D 4956 bytes

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