Malicious PDF — malware analysis report

Static analysis result for SHA-256 861f2a59a7096f64…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 15:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14440ccd0ea851e17e01cf5ce1f883b6 SHA-1: cdc198a9bf849fb9c56f5969b69a363e91831c97 SHA-256: 861f2a59a7096f6428ae360786fbd298ba37ca81812d519f2ae28c93d62cbbc2
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristics indicate a pattern of hosting or linking to potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pgp-puh.hr/fck_media/file/14056629833.pdf In PDF document text
    • http://paddockj.com/user_data/editor/ckfinder/core/connector/php/upload/files/gokukibadado.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/80494442191.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/35786892649.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/gofikadebojizorewugu.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/timozeluzivigukiwo.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/5535473042.pdfIn PDF document text
    • https://wronba.pl/uploads/wysiwyg/file/73381859840.pdfIn PDF document text
    • http://arsvet.ru/img/upload/90639137928.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/63393744801.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/10055710029.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/161321b3bcb193---jininiranigopoj.pdfIn PDF document text
    • https://mollis.rs/files/65222927950.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/30277223747.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/jesuzorivagefapawuj.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/vovataxojovofefalavu.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210909_42C4F72DC77F5161.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/73200557476.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/patifeg.pdfIn PDF document text
    • http://venkateshservices.com/uploads/14888200694.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/22060630681.pdfIn PDF document text
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/megovajokixadosup.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/18383756514.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1bcdd93d0---91340475847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mechanics+of+materials+hibbeler+6th+editionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005aa18900---38301369426.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_off0000d08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A1 18244 bytes
SHA-256: d1f151a0641d4813da25b699c3273e7af8f285f3d5213318e0e419adc560c957
font_02_sfnt_off000117b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B7 11040 bytes
SHA-256: 5a69b41b6e3d3e951dd1cffc466789ccac199f805138e966a430ad78e79c52f0