Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa0410d2e655a79a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-08 09:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f960d7d91717cf0c5f377f76a6bc7c32 SHA-1: 49626d4a671ab44a9d8c2ffc67dfa30426428992 SHA-256: fa0410d2e655a79a916b9b6d76ca468323464c96dc124a450e771c854231f37e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the structure and URL findings point to a malicious document designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8668

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://essiac.cz/UserFiles/file/xijuzufawurumojubuj.pdf In PDF document text
    • https://abouelhoulgroup.com/userfiles/files/61391989058.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/1034470390.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/1b2nt2rtrmraf6grdov44rdv96/5047886986.pdfIn PDF document text
    • http://muszempilla.com/files/file/poxeb.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8709319f5117fcfb8527a5fcd0d4d648/pubekutozu.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/956e614fd43fc159c50fccf54abf7ceb/rawobinadapamaf.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c92e0dbdb41---jarile.pdfIn PDF document text
    • http://atomleasing.ru/media/File/fosomuxolowunarijo.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/g91ntq5oha3hdoftj3smck82nq/40669298080.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/ceff01b9050586f213a297c6f05259d2/zopapurotuminurebifazodow.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/51088198055.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb568d0743---bavuwuwibikinegur.pdfIn PDF document text
    • https://ottopianos.nl/files/jorepibibulenux.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee3c5a776---suvugegetuwixebivatiwun.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d05067ab255c71c0dfb1e9fb8a8e5081/lidavudapigabexopibi.pdfIn PDF document text
    • https://rubfila.in/files/file/lulixutew.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/38531445828.pdfIn PDF document text
    • http://darienhigh69.com/clients/866565/File/fizaxakav.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9de55a110510c035e92a129f439170e4/9505486489.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/judipagija.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/98602462418.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7924d3c8d---82513796068.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca10b89425---feluzodakofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=withings+body%2B+manualPDF link annotation
    • 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_off0000ec7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 18944 bytes
SHA-256: 6055ef2e3303530c7f758effdddb6bba3d8963b08ac4b5dacaaeb36a5ca5faf3
font_01_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13595 10808 bytes
SHA-256: dcf248ff874e7ad85bd525457e075314d375cc2ce4c388b3e4fd4b74ac400aa1