Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cd5f9a2290d67e6…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 15:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ea9e759942ea85f3d3534a91ad16176d SHA-1: 92e929bf38abd94e65f936f6306f5bdcf3f5213d SHA-256: 9cd5f9a2290d67e61b14dde56ea54d842b0ea5f3e41c02896b99a5bcd3c97ab6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is part of a campaign to host or link to malicious files. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://medvor.ru/uplcv?utm_term=shia+and+sunni+difference+pdf PDF link annotation
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/pumedujofasenosabubebe.pdfIn PDF document text
    • https://bachson.net/upload/file/1499182450.pdfIn PDF document text
    • http://szhlfz.net/upload/jiravetojosalubaledubaj.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/nelutitunelisu.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/97404785624.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/31071948598.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/jakufarixugibasodade.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/bc5bb467514f6d424865b0e25f3dd76d/nabaso.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/9004453907.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16135f617526d0---95382178172.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d065a394e---91043786276.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1612f61df00bbf---suwamurer.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/19506419414.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/87479894289.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/88129510643.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338a945ef82---lefadugegelobitaxepupa.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/mipibeluwufalotitisafotev.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fikinisonabasa.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/83825396276.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/gejewunizabaxurovujaros.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_off0000d704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF16 17808 bytes
SHA-256: bfab5cf252e51cf1c35d2b44670be4f79184a9f7eaa2cdc82e8b493d4f3efcf6
font_02_sfnt_off00011cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF2 10628 bytes
SHA-256: d306b5b43781b87a9fd7027590fe30ec270d295cfbbebbea9048fe551083b97a

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