Malicious PDF — malware analysis report

Static analysis result for SHA-256 a54fde2b78b7d67c…

MALICIOUS

PDF

70.0 KB Created: 2021-10-03 12:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dec921bf56297d9e928eebd1e7e75967 SHA-1: 623d64eb55d372c2aa1fe6f9d292bc0a25b2373f SHA-256: a54fde2b78b7d67ca67ff4f69e3825793093047be3a9658f77bd5431642a9d20
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chcial.ru/uplcv?utm_term=class+8+maths+worksheets+with+answers+pdf PDF link annotation
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161538f264487e---xurudadunazozogusupax.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/fovesuzusupeku.pdfIn PDF document text
    • https://kezmosas.hu/files/file/23397765273.pdfIn PDF document text
    • https://gornjastubica.hr/files/65610889727.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/bbc18994a6452f3517c38beb3730fee1/tudowo.pdfIn PDF document text
    • https://projetovm.com/uploads/files/zofuxibaxebifo.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/beginepam.pdfIn PDF document text
    • https://parisnordmedical.fr/docs/file/xexifirevufaluw.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/49702123952.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/lafezixuzakinan.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/66174012290.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/megoweveso.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/62195776621.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/vuxenijokebenanon.pdfIn PDF document text
    • http://bankerz.in/qpic/files/lomoninukukulewiterop.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/siduwen.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad3e3e49d4---65695793713.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d39386e03b---616591864.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/wagibud.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/mexojovepadupu.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/2904790183.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/86666758922.pdfIn PDF document text
    • https://mackbeks.com/files/file/wizamezuzibuxefa.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/54650047939.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133b881ef15f---15483219946.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_off0000b1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CB 11180 bytes
SHA-256: 80a918587bad45375bf617e764b4458a92cc1d50545b215c0d0f02d513c9d99c
font_01_sfnt_off0000cbd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD0 15384 bytes
SHA-256: c5166c84e8c59a50af2b9fbdb5ac9e02ae6792021fb2cc8b531a1d2206517d12
font_02_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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