Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d3875e624de6b8…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 19:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d5d61bf4d44f80d27fa2604960f704ec SHA-1: a95c40fc8ef6243287e7a0450cffccdd5e66598c SHA-256: f9d3875e624de6b86da2bae4c3d7289e1731735a6ef7fd13a9d93de869c52866
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supporting the nature of the URLs. The primary attack pattern involves leveraging these links for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://medvor.ru/uplcv?utm_term=maytag+gemini+gas+double+oven+manual PDF link annotation
    • http://plastikacz.cz/soubory/files/39073371767.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/15139722123.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/pqv5c10oub5lcdcics9oakuvlo/duresukovogeposaduxexawob.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/927371ec1559c2ebead46828c72b991e/nixebanifebufeniri.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/7f04de98358a750ea36a10c81b428f8d/11392150055.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xegipawavimaf.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a5cf298a3---wexazow.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/82519179017.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accd52ead4b---gufitugadubux.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/revilifamibaweragerovu.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/fatizubixebo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073bad991017---nurijit.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/jamite.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/bofigewane.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8d9383bd0281d4c6b74f4f4479524a03/10152445637.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/mixam.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/27231383855.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/11115897685.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2732a4ae8e---pusamopez.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/18486671131.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/49334082567.pdfIn 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://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_off0000c47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47A 18204 bytes
SHA-256: 041b77d72f2f59e413b7f6bde22897cf40592191f6f928023bb031176dfd422c
font_01_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 10904 bytes
SHA-256: e398bbb2ad24d0eb384b66350976289ff6987992475cf7251faa51dc69ef5f62

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