Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9996989424b4025…

MALICIOUS

PDF

80.8 KB Created: 2021-09-22 19:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 48c096934b84900ff8527380b6f1fcc4 SHA-1: 21b752600b573c16e530399667f04611700c8dbd SHA-256: e9996989424b4025a5b232ff4d56fb5f695368a87edc0bb322c40bce4fafc91d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics confirms the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=subway+surfers+oxford PDF link annotation
    • http://ytbozhuo.com/upload/file/180502392597.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/89114612942.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909053300566842.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140bdd712d92---4366668966.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/20640642849.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/d804a5130ee9e075cb72c045807205b3/13833078381.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/44480470762.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/xomevezigurifokelu.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/23052236924.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f184789638---39847245206.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/jinopewux.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/ximilerutarajijuge.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/aonitmeknij4uo8gicjcteib64/80464467554.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fisesa.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/petoxamazimat.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/rosirelibudozuwoduwoxeto.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/duxemosanani.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/91262146453.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/26942708471.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/79755602371.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/88386002066.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/33841359422.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/90602267152.pdfIn PDF document text
    • https://brakos.it/file/moborujuzetipunili.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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 17780 bytes
SHA-256: e9bc80b070119c0eeb1cc3ffe4780b720d2633e01c6b6279ca6b34a04189164e
font_01_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 10624 bytes
SHA-256: 9b3d2008ead28aacb97a90263eecf407e08fa9b7971a5737082c10e74b06efca
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1