Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ebd1c2a682de8b…

MALICIOUS

PDF

61.6 KB Created: 2021-05-17 11:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 883de87187e3a3e3ae0e0073fae5f764 SHA-1: 3291da4893c229ee8f08a612495ff6c759902132 SHA-256: 56ebd1c2a682de8b91ac38a6b0706d4d0ddaad10cfe6415f6d6a4f2af4e3eaa0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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://akinmedikal.com/uploads/file/85010259551.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d4ae4840d8314f10100e644561609936/rorimamozawevafegoni.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/1df247536579697091c5081eeac3741c/fomediwuvonupoxegugak.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1a7e5b7f543cbd522ba4d3d9762cf5fb/20764389041.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160945a7af0cbd---71408098046.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0fc8e8f2f---wipulegufevujes.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16071a6d600459---78104082519.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b88891b7ad724389119df233f0eae497/fexifaxopofunenamixe.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8dd7b1a36---44541215972.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079d42014548---12719514429.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d2142567---42252737861.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef6b43b37f---48594147731.pdf
    • http://php-lounge.de/userfiles/file/fobinawesesafatagebe.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082228c5c0eb---lekefugadekekogag.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/b2mj9q3h44d1qda0gvu8v0p742/todobojifufinakibo.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ac9345018---52997441361.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/f01n0ugli26m5oje5t1fl091b2/88656253223.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=usg+durock+cement+board+installation+guide
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf6.bin
a732d0c42cad589917e2234515b39537278cddb325510b7a951adef95eb2a3cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 5456 bytes

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