Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a609fa71780639…

MALICIOUS

PDF

74.8 KB Created: 2021-09-04 19:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04b72c9b4e5bd05d87324eed4d3b0da7 SHA-1: 401ee4e133486855bcb3960e08011aa192438376 SHA-256: a9a609fa71780639f0a18cc768c1414acc9e539e51139cde6d66eb508131f894
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest this document is intended to facilitate the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6686

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://cructi.ru/uplcv?utm_term=volleyball+game+rules+pdf PDF link annotation
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/6313507589.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/kiwijoxunileviwe.pdfIn PDF document text
    • http://sdes.in/uploads/33767999657.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f704dff68---jefazixinosufuvo.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/xefipikewovakudadagununiz.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/964e114b77fa0abe1e4ea15cf25a751a/20407396469.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/468286631e38102536bfeda94029dda5/23964931895.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/7jq9g7h9olh553bkc0ifs4b8da/30506170988.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/26808008216.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608857cee7591---katusupigivibumax.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/sexizelamubesupobikasi.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9d0abb417---lefunawigo.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844ed04ca84---79275448574.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102c2ad70bc9---toremalexagija.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/rugugebirif.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d24be27042b---satew.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/53186301502.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/7573586768.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/31087322592.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210510050750.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/jazurujesolalizux.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/notidimoteje.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/s06qfgcjn7n9ga9q88ae9gc0v2/10376842738.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/metujesolesof.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2f79850d40610901dabb309c6ebf0aed/32026626899.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A3 17516 bytes
SHA-256: ec52adb417abe2a4297b07dc71152bd105febd31d93042626c412644c146a4fb