Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3ff05fbb17a702…

MALICIOUS

PDF

84.8 KB Created: 2021-08-16 15:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9b1d1cb5e944491a58d3f539f46f9a5 SHA-1: edbea74f2551d5d05565e530d05bea85d661d08f SHA-256: 3b3ff05fbb17a7026b5ca18f5eb2758ab96ccf38bc5b811239dbbc5d9f358f14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress uploads and disposable hosting, likely to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly suggest a phishing or malware delivery scheme.

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://queure.ru/uplcv?utm_term=velocidad+angular+en+el+movimiento+circular+uniformemente+acelerado+%28mcua%29 PDF link annotation
    • http://podiummoda.ru/userfiles/file/jovidajibigogolelexabu.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/7831806017.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/ddee61c18ca8b57f34ddbf7186205e02/46182931969.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/14941032448.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/ep8gagpbtlmp4rnu8pe0fk5jek/16972562811.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/bipevinixokevemeli.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ed9524051---zenesabikijokuwigimepikib.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/2491103254.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/86678491349.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610f032bdf3ce---682823975.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f226522e4c44240e77350f084f590c4a/45103515692.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102f76334da7---55256936709.pdfIn PDF document text
    • https://promise-land.com/upload/file/67150962580.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210805_134558.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/9074875729.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/fajisuwo.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/70996250975.pdfIn PDF document text
    • http://ippon.lv/uploads/File/dopalatusaloneguji.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wenekoxijisapisesizovaris.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eed1605203---69518957965.pdfIn PDF document text
    • http://bogieclassof67.com/clients/71235/File/14236657387.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/976c3a0d0ce2fa1f8445d29a7a31a57b/54799227737.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_off0000e292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA4 18944 bytes
SHA-256: e0300a15bd5f09894b481757793d51719a082ead2e1e8955178df730f1d279d9
font_02_sfnt_off00012b3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3D 10944 bytes
SHA-256: 1f810d3c5961d0105aa8988ae34675a3eb8c094fa84886be85ad6f5236b67239