Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5924761a8d25544…

MALICIOUS

PDF

55.3 KB Created: 2021-09-24 22:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 65c86b6e92fd21f93c2ecee5642ad75d SHA-1: 30692702fdf7485895a324aaf8b043ec6261f972 SHA-256: e5924761a8d2554414673a6c8523b046da42c8d734343c9e07561eb9fe359607
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. Heuristics indicate the PDF acts as a link farm, pointing to multiple external URLs, some hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7772

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://accessprecision.com/userfiles/file/lafirorexopewa.pdf In PDF document text
    • http://hoanhaochemical.com/uploads/files/dupiwivudijolenalufefe.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/6520392930.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53049779833.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/26583513793.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/32603443163.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c7b467b40---simiza.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/powus.pdfIn PDF document text
    • http://htwy.com/upload/file/winizamosusamejabedapega.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebfbfecf46---98809969383.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613281bf39e48---gatepipapinawenakinowif.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/75375565682.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/ropemilafupaja.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/75449134312.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/29027604592.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134dda3c16bc---juzafidemerawusagitava.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/datelutogogewowijoju.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/6041254642.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109100853569440.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5c03d5003---sisodofagenibaruw.pdfIn PDF document text
    • https://fivetc.net/uploads/files/sisavupok.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d5ca7f83---nireduz.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/74659874261.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/53861364501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=change+color+facebook+app+androidPDF link annotation
    • 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_off0000b6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A2 17344 bytes
SHA-256: 5bcf8d0d98d010a0ddd8e612a9aeba2da0aba32f6f816d1881880c53e1015c4b

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