Malicious PDF — malware analysis report

Static analysis result for SHA-256 c142759fd98c7b1c…

MALICIOUS

PDF

93.3 KB Created: 2021-07-30 06:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1731815ad58e2b66f3cd82d42e60a059 SHA-1: 96e2816fc361374ce522552912321c25c887b877 SHA-256: c142759fd98c7b1cd928ca70ecb5a4a62b7f0637da4a22afaaf64868f96cfc3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated, but the presence of embedded URLs and the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/38840103649.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160975f692bbe8---81670963506.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/xatavutoranomazuzezej.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/zilanurejirexug.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/69120687579.pdfIn PDF document text
    • http://lphs-the60s.com/clients/5/5a/5a84a5cabe7f31a06b4bf99f7e1b7ad6/File/87367372997.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/47162669993.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/71091628882.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/givebovelavixuvamivizun.pdfIn PDF document text
    • https://drvishweshwari.in/userfiles/file/woradaf.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096183cba3da---79769527475.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/mujupuxifozi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160bb07601130b---vudowuvuvoku.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/e16c75d9f27b3f10c7a43f5ad867dae5/16971976274.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jqlq4vts30e4gc3o04csldrkhc/kejukegetirekewab.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/gekita.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5m88d2oqhtk1r9vma08crccsd3/87055493257.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/bawimagaj.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8db996d86a64545b603b86660949eaa5/91662166618.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/deropopupomid.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d3b996823---kemixufa.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/99993815155.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/nevuposixosemipulavap.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aec89367c---90060706449.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/renizixolidojeze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=livre+en+anglais+pour+d%C3%A9butant+gratuit+pdfPDF 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_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11981 19736 bytes
SHA-256: 7a08cdf42ea017c816c857f8bb1f3cc5d96c7ec42b3b9e887f479316f9a31b41
font_02_sfnt_off00014a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A53 11092 bytes
SHA-256: 4c98b99d3454811f19b610ee60b2cbe10527c60f67ead9290e8efe12bbad6bf1

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