Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f21634d8ce96b1a…

MALICIOUS

PDF

94.1 KB Created: 2021-07-31 01:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71766cdc8b8a406fb81a17d2337b82ee SHA-1: 7c49b1cde40e7eb6f809498df653f04018b984fd SHA-256: 0f21634d8ce96b1a5a5e1a839014d5bca6efe47fa9fe58c859d5e0b1232a8d20
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to distribute malicious content or engage in phishing. The presence of external URIs and the overall structure indicate a likely attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://rsst77.ru/upload/files/miboraz.pdf In PDF document text
    • http://www.kickcommerce.com/userfiles/file/nolukaj.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210715114114.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210511071113.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/6261279265.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/33009985091.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/bifexipulav.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a65e447ee25---13234538846.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16072a6dff3972---37133314670.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/kadupiwijegubotufodo.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/bdb2f2ff23ed1bd54fe2b0a5aea8664a/setufikeviwazip.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/vumerarozumarexifemekabe.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/15686622846.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/vafugumomem.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/gexawiletopejike.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/21foei15mgvq280aqu59auk502/12410719760.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1a8f2e4d2---68895507540.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cf4e47c96---12384193677.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8eu6s37rmiqdh872gaff776qj4/33534501785.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/08cfad23528c449349d532f6f3a2f014/11730616371.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86bcb51df6---83897247331.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/71913691143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+police+report+car+accidentPDF link annotation
    • 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_off00010e24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E24 10676 bytes
SHA-256: 2da97aa82c2ff1ebf0bc8f2cbd178e8f12e157bcca7dc967d4103791e0e57419
font_01_sfnt_off00012689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12689 17152 bytes
SHA-256: fa2af1d154eb752cf4b650180cecebd68d61b8d14696a2f1ddc1b4af6d86caea
font_02_sfnt_off000152f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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