Malicious PDF — malware analysis report

Static analysis result for SHA-256 f885b4512890561a…

MALICIOUS

PDF

70.9 KB Created: 2021-06-24 23:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fde84db6698f697e4e5676177f01df60 SHA-1: 1e62b67b036d62821f85e12112ca9996284ef131 SHA-256: f885b4512890561a9ea85806e0c1c0dcc113c2fd6696ec37a09edb332c5e8c12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs hosted on compromised WordPress sites, suggesting an attempt to lure users to malicious content. The document body is heavily obfuscated and appears to be junk data, providing no clear user-facing content but containing metadata related to PDF generation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9688

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/5iu6v50163sfdg3p7cbbt33575/japoxij.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/70aa66347c5199f65e5f56f3b4138cf9/bazinovuxapuwobiwideka.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afeb644a41f---40702344229.pdf
    • https://wegofa.com/userfiles/file/nilomamokafopikupotov.pdf
    • http://kalikraft.com/images/file/11578793836.pdf
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/vomozaxagagejiweboguji.pdf
    • http://school19-zav.ru/userfiles/file/24510143394.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/704230502109fa08cea6f9d094ebf3c2/64538753234.pdf
    • http://bephoangdung.vn/uploads/ckfinder/files/tibemotip.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/84g8gu1rdr1ivme6rg9nag11cp/sixis.pdf
    • http://colorfulmedia.de/fotki/fotki/file/88009117831.pdf
    • http://broadgatecapital.com/userfiles/file/tepabarevubex.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/v46fegv9iklfc2djicg3n56bf6/76310703026.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2961ea6ef---72339881541.pdf
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/8886505254.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/t2gu5hhmu3tfssstc0vqlnig97/fepiwoxik.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wlan+topologies+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin
6863ab3dce9ece6da5c3be6b331ba851a8dd9e518f3eec8271dd2839f7db96c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 5124 bytes
font_01_sfnt_off0000f4ed.bin
484e36c15cd7c60c2dfeb81289b2857ff12e74949dae9f79ddced13f13b4cb13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 10956 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.