Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7ad4db0a081d35…

MALICIOUS

PDF

75.6 KB Created: 2021-06-08 21:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 80c922aa3915ab44d6d8337de2628c2a SHA-1: eb7bd1d3e11e671aa060ec64a15c4f7da4f54edd SHA-256: 9a7ad4db0a081d354f4b845fd24407372bafd2d0ce2672e6e5b0ce30486f3118
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and link farm patterns suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pistant.ru/uplcv?utm_term=yellowstone+episode+7+season+3 PDF link annotation
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/41bc479de29d4d45a682a1646ca5d195/25309325358.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098d4a228b49---99214217845.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/1f1579782d55a1e3995db30cf9fc64e6/mojalogupupixuxix.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa0a23ab70---48584496073.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/91b6d016115699d9d3c6579dd6ed998c/lixoweribinitez.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/dagixi.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105160000.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/mq2tbim5s7d12vgcrtm9jf0ltl/defoludodofazena.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/76299531852.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe30768c17---71321904239.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/85836970368.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/bizifaruxadukazu.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc1a28f4c6---pinota.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/87607028120.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/6162633205.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 5156 bytes
SHA-256: 6ba5f52ba17e06420e1942063a097e3b3258542550704bb7cac1338bf2f98bdf
font_01_sfnt_off0000f9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FC 11380 bytes
SHA-256: 885559db27235df3f0bda1287eb26cb105d2d6b3ee54619d973960b1bf4e3ff3

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