Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67146b246328946…

MALICIOUS

PDF

73.4 KB Created: 2021-06-13 00:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4e2fc36c272d01b47c978b8f49c492aa SHA-1: 0b09e90e441432c24b28f5a4370af6ab33687b55 SHA-256: b67146b246328946d779f0a804e77aecaece7a46e703c7d9393bfa5f84f4aff5
154 Risk Score

Malware Insights

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

This PDF document is detected as malicious by ClamAV and an ML classifier. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded URLs, such as 'https://coretry.ru/uplcv?utm_term=gta+sa+grove+street+clothes', are likely used to distribute malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7482

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 https://coretry.ru/uplcv?utm_term=gta+sa+grove+street+clothes PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06eda8eb0---4937763586.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608952387dcd9---gogijobowomirutuvegub.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf94fa2987---2157380502.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/04818af9ee246591a9c8288cc73ed3f9/fumoruladisafewemot.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/eekk0rnos6ab1f3o1moiedcav7/26062384098.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773c7e23737---pikoguvosiburirugexu.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/ea9311f0733e6c9de1666f3e07691c20/totafifoget.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/bejezikepatokijuxobiv.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/kizirixedobiti.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aecdf042d0---62932657789.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/porizigixokotokerukix.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/naralanobebukubox.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/kovogatetazelanun.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c19a3ab0bd251fc79c93b213236b7749/18486514356.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16093e639084a3---22246687733.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 5152 bytes
SHA-256: 9314b8c82d63a28d0fdbb663b91620995c84f27b30e9036294f6fc96e475ad0e
font_01_sfnt_off0000fc8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8E 11576 bytes
SHA-256: afa84b16b5c16f79f6e8c6ecab2801e002b3cc23fda3b984b02ea3e96b202f32

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