Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5302587a177a85…

MALICIOUS

PDF

85.7 KB Created: 2021-06-25 15:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0b09c3e39bec870ff149b332654fc67a SHA-1: 19c05cc976b12d96ad99daae3b5cabc34c964532 SHA-256: ef5302587a177a85cf3fc53d98db99564da85e697a3ed5d488773babe4fd066f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The heuristic 'SE_MFA_LURE' strongly suggests the document is designed to harvest credentials by mimicking multi-factor authentication prompts. The numerous embedded URLs point to various hosting locations, likely serving as landing pages for the phishing scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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=watch+prince+of+tennis PDF link annotation
    • http://apexibd.com/uploads/fck_uploads/file/6490144722.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c110efd26---midazesa.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/duvirokaxidusexuvu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7133545a71---24171808989.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16075eb750870d---bubabavinajariva.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081cf4b08c7f---17167972930.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/pafen.pdfIn PDF document text
    • https://etimes.mn/uploads/files/34128416185.pdfIn PDF document text
    • https://actor-conseil.com/files/file/sesediroxabafagixemag.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8bf21d4a9366fae3ce68bd1b6d4dce9c/vokosebetatubunuruk.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d6b162d38a06a0f40271cf8ac51b9770/zuweg.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c12a51ae4fd---71910464892.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb0f7b5f99---rukikirepulexivijelozab.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_off0000ee66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10678 17036 bytes
SHA-256: 396ecff9f64c5ec73daa0ebbfc1a9e1a674f158df17017abd1a90bd917f5e86f
font_02_sfnt_off00013299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13299 10524 bytes
SHA-256: dec8f3f3ee77adb8f0d6728902c9e0ef3c3cc06be17ba7f78a6c99eedafa059f

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