Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f76e60ff1260c25…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 07:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77693aedf027de361cfef2640ff3b244 SHA-1: 5a83e9bb4f8f3ec1ff49f24a5059297039361511 SHA-256: 1f76e60ff1260c25edfc6310221ef3956481a2791d3552cf3538299171d3ad7d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body was unreadable, but the presence of numerous external links indicates a lure to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 https://xn--faade-zra.ch/ckfinder/userfiles/files/subidedonolubuxebez.pdf In PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160900597d3701---15208516767.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/d321dbe8377bb3cc9b3c7951a857008d/76893582623.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/b8f2kmqpninqucbupqhjmg777k/japewimuganesijowiv.pdfIn PDF document text
    • http://zbigniewrodak.pl/galeria/file/zezelazovavusi.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/zusobajidabotubisudupulap.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/22838848473.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/f80b83e749f3aa8834db6340a6f1cd97/37086847189.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/domosavujadebojinadaneg.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/50309741924.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/75106149939.pdfIn PDF document text
    • https://computerzone.pk/file/38016807645.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/18490152827.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/ruwilupebaguxutoxuwor.pdfIn PDF document text
    • http://le383.com/uploads/files/dalejelu.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/7681487930.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7dd8230e5---batezoserexugakobafo.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/dipomonuxujos.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/jibilujisuved.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082455e05170---fejibesomuponamejebu.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/16935383009.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3621e8eaac382cce7b599080e1d90def/zowem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=normal+drawing+room+designPDF 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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB95 10556 bytes
SHA-256: de26ac3a40c12a2d00fb8b7d385f76b1aa9ec89c9e0f2f2684f6dc7b9068bf4b
font_02_sfnt_off00011369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11369 16468 bytes
SHA-256: 47789dc1383665eeb6fa07e2b5b569cb24ae504609594e4e41df4a6f6c539b75

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