Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86dbe14f4f27e63…

MALICIOUS

PDF

61.1 KB Created: 2021-06-04 23:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5c28b99c6d1cf91863ad734e6089a27a SHA-1: b9b9d9afa78d7cf73d3c1eec18c3e6c39212c534 SHA-256: d86dbe14f4f27e6399c55089a11b2d17ec1f6ab3e5361dcf538af03e35c2968c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to obscure the true destination and potentially track user engagement with malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

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://queure.ru/uplcv?utm_term=8+ball+pool+trickshots+mod+apk+long+line
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078e587c8fa0---6119856334.pdf
    • http://anhbanglaw.com/userfiles/file/lobiw.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/274a0d199bd58423f07d2cb78266b5fc/21577961378.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f69fc2e006---bobuwo.pdf
    • http://fresh-j.info/images/uploadedimages/file/61804931197.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/590062e1d9a917aaddeb100abbe83f42/8388201947.pdf
    • https://aviseco.ro/userfiles/file/16082958201.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c7f1bd38a---85531161274.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c5578d0fe---lukojogutovujetotojumo.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832cfb418d2---pejitelu.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad8d6e2fc---40282994497.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160828703653c9---63645329178.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/kvntnlu6s8ii99725mmq8l4km8/23361986524.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/uknjv5ie11m98gjarmcujfppp6/55320868197.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f6b16550212cac2d4dfad9365112560b/15140741235.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_off0000dcd5.bin
d6960fb186253f49fe752c4b5e5a6baa7839c565fa7ed88130f72a8f8d2f0124		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD5 5580 bytes

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