Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d12d67d0371b71b…

MALICIOUS

PDF

61.8 KB Created: 2021-06-22 20:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f54fc31738b1ef2759bb7360b0a4c2e9 SHA-1: eb748870a3a7e48fc49cd206bae687c622da25e0 SHA-256: 0d12d67d0371b71bf89f6d07543c2685300c1c423aa8137c4d73f8d46d939ffa
154 Risk Score

Malware Insights

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

The PDF file contains a link farm designed to redirect users to various compromised websites, masquerading as a free English speaking course download. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or phishing content. The use of compromised CMS upload directories and disposable hosting suggests an effort to obscure the true origin and purpose of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 http://amoy-art.com/Upload/file/66567639411.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bt45el2ome7aj6hln8tm3be0k6/zoxofukepelavexi.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/6caf92890131da658d57c6891008588c/92361197384.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca3c607dbb---13587948811.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/iimfkj8o69nbhjsdvbaej84ekh/63433361880.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e962d05ce2---bibiwitevativ.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7654929d---2822145138.pdf
    • http://changwontour.kr/FileData/ckfinder/files/20210617_7D42F626A8956AB3.pdf
    • http://triatlonbizuterie.cz/sites/default/files/file/82714230257.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4b82c5ed---zesakifimifasaw.pdf
    • http://ozari-ua.com/files/file/83983434232.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cb23a7587---29329336812.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608332fa0bd6e---kobirupofomek.pdf
    • http://ersatzmonitor.de/userfiles/file/virutajakunomunaw.pdf
    • http://wildpflanzen-planung.de/file/75968989332.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16081fcf9a02bb---polifitubili.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0378ac0b9a---bemuzofib.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=perfect+english+speaking+course+free+download+pdf
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71f.bin
705377623a4c4344e02470fedf876d1ed6f0c7c0eac322cafb15afc9430d14bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 6440 bytes

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