Malicious PDF — malware analysis report

Static analysis result for SHA-256 0dcd442cb657511b…

MALICIOUS

PDF

73.4 KB Created: 2021-06-09 18:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 273041fb47b1f774cf8bcb3ac8de9095 SHA-1: 0aed838570cfd4286915fa22a2f2d3b4b9ec8145 SHA-256: 0dcd442cb657511b835de82f318688eea46f38ba955f50c85563bb8f916baae4
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The document body, though heavily obfuscated, appears to be a lure related to a workbook answer key, intended to trick users into visiting these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8418

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://synerhu.ru/uplcv?utm_term=solutions+intermediate+2nd+edition+workbook+answer+key+pdf PDF link annotation
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1038f2150---77053810352.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/tasq8a9ksg1gm0vm06gf2urnqu/96012818612.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/wirivejime.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/vubofowewenem.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab83759f99---tinowifojuliba.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1608529894f678---bosebivizemerevesefimo.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef60cd1d56---96241916813.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/sad4h81u44ct25tnse58q7rvk7/42856498209.pdfIn PDF document text
    • https://codecs.roimages/file/22380392815.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/urlv4rh58enlr9dkejjnc78g45/zufejisazavat.pdfIn PDF document text
    • http://freeski.hu/freeski/file/peranipufurub.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/797de1eaa34eacf082c4a407d2fd4e84/gofemowizum.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/83203002916.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072e55a1f108---bukarokavakobifojotug.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a63e52c99f4---dupoxim.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/7125c69ee35733f6092369ecda864655/17046281456.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/41623421506.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/7ad10f45f5cf94799ee9d162658fc066/rosem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10255 5820 bytes
SHA-256: 6bd858c46032ec703834cae28a5dd280f7602e4d7ed1eb658a5d34d0d6b3a495

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