Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef907ccfc1a60822…

MALICIOUS

PDF

77.0 KB Created: 2021-09-24 22:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ae678de6bd934b0105962c654721e210 SHA-1: adfcd9c0bd3d5c2a967d2aabfa7298cd1e16518e SHA-256: ef907ccfc1a6082237ff1f93049a9eb222bf211fe08d26c392dc764de6d310d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ketchas.ru/uplcv?utm_term=simplified+forms+michel+lauricella+pdf PDF link annotation
    • http://inciboya.com/resimler/site/files/nenametasujojadoduwu.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/turesonobomowo.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210911213253.pdfIn PDF document text
    • http://partnercable.com/files/4925556835.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/46166820033.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16133e04ab45b7---43925259394.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/98676947330.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9a2cc729df77da0c7b2d966547822835/nazawiduzijuvumiwabigep.pdfIn PDF document text
    • http://deauville.ru/files/file/zobinelagabizojifo.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109242329255723.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/10073083894.pdfIn PDF document text
    • https://asiapharma.la/files/files/dukiwofisofexowaz.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/vefibakovejijebugasonuli.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/59218064750.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/64912829407.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f0c2db5855fe3a40b99828e44ef03b03/munazes.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/2387795075.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/95906735838.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/zivilowamimokajowovalopad.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b6f875740---17007480354.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143350d5159a---bojobatasoba.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/bifujuvuriladurap.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/ropobusofajexepigogiziwi.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_off0000c0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0EB 20060 bytes
SHA-256: 8ac14924e910256b1463e8f1d1ff176b802a2a203063c3b14f6d3a5e716178a5
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 10856 bytes
SHA-256: 37fe11cac17b9dc87f2533ea1c660f8a4c1fb34466962545cb8b9107fde4b5d9
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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