Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f5fc6ed8246b0f…

MALICIOUS

PDF

67.0 KB Created: 2021-06-13 22:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28f49393f9e430c877729c2f7e602c43 SHA-1: 161f9dda5f1ef2777acd146b448d38c22402252a SHA-256: 98f5fc6ed8246b0fca1c39b84335098c2b0dc6e4c8088649304ed71673cbce2b
154 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, which in turn host other PDFs. The document body is heavily obfuscated, but the presence of external URI heuristics and ClamAV detection strongly indicates malicious intent. The links likely serve to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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://philabc.ru/uplcv?utm_term=xenoblade+chronicles+2+combo+guide
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/0c485e5b4df9d9da2e3577231c1d8c65/79033993031.pdf
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094a4611b152---26461773007.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec37310e43---28048556902.pdf
    • http://3dtechgroup.com/uploads/image/files/28528198435.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ofehccdhr7r4son0oc9ck1t3k8/1479752544.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160989a021e0eb---fenikubovigezavudogemowab.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dfb523329---javiditazeliwanuvewazunun.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//31773702083.pdf
    • http://geostudio.eu/userfiles/files/kisiw.pdf
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/183b36e2a2dbe9a31e9519f0702d81e0/43841257839.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607156a810333---8523127425.pdf
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/4caeba769ed056f13281b7238d86acff/99278606203.pdf
    • http://diamond6ranch.com/userfiles/file/murejebe.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c14e1be92---94480674494.pdf
    • https://syntellect.ru/Repository/file/10412781987.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_off0000f0c4.bin
2c5f95d671be54f18952c98a64c9da8d0bdb022639051743165d110c7976ca71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 5600 bytes

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