Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4966150e7baff7a…

MALICIOUS

PDF

77.5 KB Created: 2021-09-05 22:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d4f0d730b8e61986621f862d299fa75 SHA-1: 1eed7ec50f6f3a75745615babc22982cad3f4139 SHA-256: a4966150e7baff7a538c0eaca7129490fe163a0678e0226b973e37c6e6dd10e8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing lure but serving as a container for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://shipagents.nl/uploadfiles/file/89079820712.pdf In PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/13744950926.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/83403430697.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/nolewowaselosidododi.pdfIn PDF document text
    • http://staropolski.net/Upload/file/38732726646.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a126e4827---vanekaxarobolive.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097492e63f57---10425702.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/bafelek.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/6ltnmbt9n7dafr6ogm1sbp0vr1/9650055492.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/86467791654.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/fesazegavabeludipalazigo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8def1f8f0---kobisibejube.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/78707249510.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/7563495595.pdfIn PDF document text
    • http://citranco.com/users/files/tagimilisoxemenemof.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/59743652156.pdfIn PDF document text
    • http://veitali.com/upload/files/kemuzulijaxegim.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/logabaz.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aff52d0fde3---77580911442.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c63b05df1f---zedutagibo.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a6cde23ad1---99347049922.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086054071a9a---70778673064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=casein+in+milk+project+pdf+class+12PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 17944 bytes
SHA-256: f3613d316cfb654053cb5857f8f2927eb3c53c66f4296d936324621326ced0cf
font_02_sfnt_off00010e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 11204 bytes
SHA-256: da08868df8cd5b5b2bda4f0d16def9c6d8d6589cbe834c74d59f130c30434526

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