Malicious PDF — malware analysis report

Static analysis result for SHA-256 725d5bc3f422a44d…

MALICIOUS

PDF

57.4 KB Created: 2021-05-21 20:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 79d33e1f3ad0b937304eb2db79b4e6f0 SHA-1: 035914f0086b5c993fa6e913e4a9f09726316cec SHA-256: 725d5bc3f422a44d8da40ec8bd294d3fceb4aa15dab65d3b4ea03b3c2c053d13
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external resources, many of which are hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics suggests a tactic of using compromised infrastructure to host malicious files, potentially as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7659

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://oniceh.ru/uplcv?utm_term=template+hotspot+mikrotik+responsive+gratis
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddf289c05a---89908558961.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a56a558c4---zekarezilexenibuk.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7ce6b4864---lijexi.pdf
    • http://lumieretvie.com/userfiles/file/2216150709.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c9164fc3---66304017725.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/32b2cbf64de053c0a2cdbbfffc2716b2/48902034195.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609546a30afd9---fevarigomagapiviniw.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d002bf1a58---puwejagotetowon.pdf
    • http://alliusie.com/userfiles/file/wijalutulizu.pdf
    • http://www.abcklima.hu//data/editorfile/94924822035.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091a7f1ed79e---ralaturanirisevuxazon.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210506023958.pdf
    • https://walkandsmile.com/userfiles/file/3177605737.pdf
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608120fe7dcd6---jebew.pdf
    • http://beautybybelief.com/admin/images/file/paxogi.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/9d0910360ed436cf2f43381a00f26448/guxizofepazenusozoge.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160841afe91e2f---83182217534.pdf

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