Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16500fe71e6a074…

MALICIOUS

PDF

80.8 KB Created: 2021-09-03 06:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 580c5d5d12dd1fae12e7624ad96d028a SHA-1: bca5b5dc461e737ba1da1ff987da11911115ef02 SHA-256: c16500fe71e6a074ba2d8a234ce8468133524ba46d538c357627b68bb6d5013d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. The presence of numerous external URIs suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://www.integra-cr.cz/administrace/ckfinder/userfiles/files/ligagogejokovogupabutuwi.pdf In PDF document text
    • https://12tiga.com/contents//files/79506689905.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac423988928---59311507914.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/96716666540.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/16358271367.pdfIn PDF document text
    • http://leguido.net/files/66895505483.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/93226480696.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/96454282631.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/dawasi.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/23784692344.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/zepiguloju.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/rejubidinuguxifodesedixop.pdfIn PDF document text
    • http://ahchala.com/img/file/luruvawizipo.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/42092748435.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/62831378360.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160831fb9687f9---nugas.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/37666519075.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/84522119070.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/95298784650.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9fa3eb4c---fanor.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/buxedutubugado.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/17933395829.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/soragololitimimevik.pdfIn PDF document text
    • https://luminex.pl/upload/file/89058473729.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/1b87ade73e510a53440b7713e50a04eb/6473058440.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eaf1188ba5---74419067947.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hebrew+alphabet+script+pdfPDF 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_off0000ce90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE90 10708 bytes
SHA-256: b19834753e4e6d5e4017733d918372dde18461d735cf163106dad1d717ee12e8
font_01_sfnt_off0000e70e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70E 21152 bytes
SHA-256: 44378f3ed11cd83b61a0e7aaf62582607d805076e9ea35b334fce04c641525ae
font_02_sfnt_off00011da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1