Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd94dc1fbea0ea18…

MALICIOUS

PDF

66.3 KB Created: 2021-09-26 12:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82149b91b76d52b3e61a3b83afdeed97 SHA-1: c2d4cc96f742a5461bb6bde6a1a6fcd1bc28ba50 SHA-256: dd94dc1fbea0ea180132b4df7acd0d1c1b6fbcdd1d55dbdeab54bfaa7e8fda78
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan. It functions as a link farm, containing numerous URLs that point to external websites. Several of these URLs are hosted on compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3110

Heuristics 5

  • 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
  • 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://www.champagne-cornevin.fr/ckfinder/userfiles/files/28387490802.pdf In PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/23495548805.pdfIn PDF document text
    • https://abss.pt/userfiles/file/40185905327.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/najamiriwefekaxuzibo.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/fekiboturogusa.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/jenelunojasakasukoxis.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/mojazi.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/64428762042.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea8160eda5---99398053007.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/jonof.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/97746503883.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/mezuvoxozosexibibut.pdfIn PDF document text
    • https://wic-net.com/userfiles/file/26420166211.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210924234448.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/20501785296.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/malifekapulitowogetiwiso.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/bexitubop.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/161502836638d4---musorabok.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210905_F0E30B74329A4F17.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/xusibeduwonalexoti.pdfIn PDF document text
    • https://oferta.lt/i/File/seroraw.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/66221354696.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/50603259997.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4624de51e---71109667364.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/23883932793.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/6366806801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+email+iconPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA10 17836 bytes
SHA-256: a0b8419e97281d14e345ec3c1c9d055e23463462d9c7c5770f54559bc9660341
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1