Malicious PDF — malware analysis report

Static analysis result for SHA-256 8655ac4705f36012…

MALICIOUS

PDF

58.4 KB Created: 2021-04-30 17:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7dc1e415b888b8cc304dfccae9604f0e SHA-1: 871899e4de6ad12bfc15d6e332278fb6b539de12 SHA-256: 8655ac4705f36012698f7992b13d3e73e0edea0902f00efb3af3611ffab78004
124 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8253

Heuristics 4

  • 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.
  • 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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160897bdacc1a4---632192013.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080cb83dad64---62275604035.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608258eccc7bf---29498368044.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16089c60983859---54829600233.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a14cfefb52---pidux.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070704fb04a2---71563506055.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/523bc0a805f13bc3b44b775240718b8a/risun.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/238064e4318539e1d86a2f7e9150b7b6/kigonakojugob.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1dgl8pcqf5sh8vus05hobumrl2/binudozet.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/aa87f0b618bf9df72242df9a7c48a565/59053797466.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608223e107ec1---58424277041.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4283902c5---gidutibavadazapo.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/q7iile4qdgd3mbtd6hf76r6ul7/12705698750.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/4a7092e0a7b28bdb25a2c907d99bd995/pesatafiwuwok.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sg9brh0n8ldgv2atlmu2tvrcbi/20860984960.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608b401918971---bumitawidozapefipi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=rooh+bohemia+new+song
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c891.bin
d47298747af0a3be19184f37f3bb4b013649cc61608439f383ae4d310b1c48ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC891 5208 bytes

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