Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0cfeeb5fed56be2…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 02:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b47bc49631ff097d7bdd3a1e2883bb46 SHA-1: 0a494c0a31844d668c7167777bfbdf589e177074 SHA-256: e0cfeeb5fed56be2ebab47855aff6aeaa5fd6effafa09959ab693a1d0414ff8f
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains multiple embedded URLs, some pointing to compromised CMS upload directories and others acting as a link farm, suggesting a phishing or malware distribution lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c5bb9c302b6d2f0c778a7301c09f786/gibikowawigejagamudikuv.pdf In PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/84900905573.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608740fd3256d---40933890169.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/rejixosotofikafepi.pdfIn PDF document text
    • https://rajatotogroup2.com/contents//files/maxagofotewujezu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/34518189274.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/20227775767.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/livinagirexavikosu.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/pufokemagapalalap.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/tixani.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/24630610562.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b785b8477---13928827877.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/fodadifazirigazevexi.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/korivukitajirubu.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/6f27bd9eaa6ca2b6ba5426d58ced2246/32087189428.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/c1fef10fc3a9c1a3f2cc7b3f8cab0746/gesixipapakufaxutid.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/em8jks8pl4el11f79h7n1ac9g3/39545705538.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a94ac761b1f---kevux.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ii695qgjb4usfpfdtqkgfslg3a/sakapolelunopija.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/38743388616.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/ratujinojixisozumis.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/18915291919.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pacto+de+derechos+civiles+pdfPDF 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_off0000c465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC77 16484 bytes
SHA-256: a599ec681da27a51a513bad1754cdc3747a7c5848400a80981a7f7ac828e325c
font_02_sfnt_off000105c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C6 10680 bytes
SHA-256: 275f82967c80c2b66e4afb5cfcec1c6b49f7bece97ffa13018f5e1787df67809

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