Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86ce7c80fe3717c…

MALICIOUS

PDF

77.6 KB Created: 2021-08-08 22:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3c676a8071bb8ff8adf1d7e82cfc5e6d SHA-1: 3ccf25bc75e175bc6b6b10eac3d1e1d452867b77 SHA-256: b86ce7c80fe3717cfac1e61f11cb08aae09efc73161dab50ec81a679990fccde
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5355

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c928c05bd---88896999262.pdf In PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dde930e5c---14689840270.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/2ab9586fa59ddb51e0fe6f69b594a67c/vilipo.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jisug.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d57abd532---sudaxevo.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077693d852a8---metefefadozose.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/s1qvtsr98qufi95qsk5f85bhp8/gumuzu.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/wadexigobokopigivos.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084aa6ee6315---jariwasinepewavi.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/zamebe.pdfIn PDF document text
    • https://lesura.net/userfiles/file/20851514017.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/c260747708091a6df15972199d791013/20593528871.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee70f0458a5---danaxevobipokekodax.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/tunog.pdfIn PDF document text
    • http://www.mediagrand.hu//data/editorfile/niwasijidelu.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b3e40234---716663281.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/rirefumefefamuwu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106041032181423.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/purofosewige.pdfIn PDF document text
    • https://autoskola-scp.com/files/85488289923.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4aacc97d69---fovevonavamixuvev.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/pesopo.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8c8a0cf6---lafujawesujoxujodime.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/53166937346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=lowes+troy+bilt+riding+mower+baggerPDF 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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 10888 bytes
SHA-256: d398cb525a243b7c780b569621317b78800723ea61f445397e1f2642a9f03164
font_01_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1