Malicious PDF — malware analysis report

Static analysis result for SHA-256 247733f695b88068…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 20:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5869217aab30ad4f924d5a841e527a12 SHA-1: 6df8793d25c999825cca9435e0c815afb4e85c63 SHA-256: 247733f695b88068e12f59d711d2fa9dfa1f609672b5ed3e4c4ee33a3028a737
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, further obscuring its true intent but reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nomylo.ru/uplcv?utm_term=legrado+definicion+pdf PDF link annotation
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/e0ohh9vg1cg3qiej23lrl653tt/najozu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b53c4c24a1789ac090ac6ef43adaf378/nixagodijetewubini.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba282d9e87b---sisodoruxuvigojerunowizat.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7dfa533fe---fonoposonapitup.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/60797997966.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0375b46b091662c10071f06e7eb24c86/zofitujetitimabaxudadix.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c434961831---riwaseniwalofozuvuwe.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/782f6234fa1cda1a50e22443fa8ca63b/vamevaxonojopakisaduduwof.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/30345081168.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2cc5ec41c---mavipez.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/metuwaxasuna.pdfIn PDF document text
    • http://rld-carbon.ru/file/53601528981.pdfIn PDF document text
    • https://bauarch.bg/files/14696459831.pdfIn PDF document text
    • http://maryamghiasi.com/images/upload/files/bumelimaxijunawejuzepokag.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/fogejuganinibusi.pdfIn PDF document text
    • http://kimthienbao.com/userfiles/file/mujovumomezefigim.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/a6dd656726e3e069393046dfff0f46bf/71403574107.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160976f365c013---dimusepuza.pdfIn PDF document text
    • http://megalaserasia.com/upload///62140918481.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/98808724204.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210703_063706.pdfIn PDF document text
    • http://diskacme.dk/images/upload/file/70108146182.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/l4d5kvccqpr876ahe5692phhup/zabevoro.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/tubugilipolut.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d01f6a335---pejot.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_off0000bdfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD610 19588 bytes
SHA-256: 1ed8257fe8b06cacad34ea942bf9ef6293ecce0ff475d3088a9a0f28961f4d3c
font_02_sfnt_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 10440 bytes
SHA-256: 72a15c6b163c5596268ef4567b4f829a83126b0685d5bbc4eca58936eae9246a

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