Malicious PDF — malware analysis report

Static analysis result for SHA-256 93afdfda7b3aa508…

MALICIOUS

PDF

62.6 KB Created: 2021-05-30 18:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fbdc77775135a7cb9e3fc450bab91a5 SHA-1: 1b856fc550a3c05d9f26cc27be4a0235c33d859d SHA-256: 93afdfda7b3aa508594af9e39b98d7d0b60c24caa4c4afa3f7ff753990167b42
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated and appears to be junk data, but the presence of external URIs and the overall structure strongly suggest a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9783

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://irlanc.ru/uplcv?utm_term=formula+para+sacar+el+volumen+de+un+prisma+cilindro
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e53ee3c64242c248eb844c59ab00827b/telixalumubor.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607778cb9ae67---nanawijate.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/4a560508e3bb75d9349288c55cdc5b8e/korisiw.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/kvheegs41ok1gbteckisi0q307/bekafeliwozepoj.pdf
    • https://betenagro.com/sites/default/files/file/tapowawobotodip.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090548e52fc4---40477878280.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071acea671b1---kugefukadevupaxot.pdf
    • https://ludifrance.fr/userfiles/file/zixizipujalutiwedonigato.pdf
    • https://cakenepal.com/userfiles/file/29715086338.pdf
    • http://pivotal-technologies.com/userfiles/file/16523737876.pdf
    • http://ricarda-allegra.de/userfiles/file/jizulomatujof.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7bf919e09ffc5d0718d16f6930065833/sesinewewefix.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9efad01e15---98841928834.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160820857a41e2---89743086993.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e2b813cb---gefezizazolabukulen.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_off0000e1cb.bin
84b213051017d76a3d9cc701e2ec02b45e154a06a221b7373d052a86a9658725		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CB 5036 bytes

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