Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1f7d51589c9a56…

MALICIOUS

PDF

59.4 KB Created: 2021-09-02 05:37:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b6e23338b7d9ec6dd7597baa3f8f859b SHA-1: 0fe234b98af4c0a534509afe6a9dd98aba3bb6cf SHA-256: 3c1f7d51589c9a56fb40a721e6ba3124491b173ec6e2bad4b7c7eae68f6ca357
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. These links are structured as a link farm, suggesting an attempt to obscure the true destination or to distribute malicious content across multiple compromised hosts. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7278

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://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c17516537bf---zasitavikaziw.pdf In PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pvs7bat1bpscrlgfb6p4er2pi1/xewotigukita.pdfIn PDF document text
    • https://artenika.pl/fck/file/gerimolidorosarolaneg.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107160432142829.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/63chv51q16ng0rkq0thvhdn8gp/nafodivaniwijifipabi.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/rajowekarudujexanoj.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/rinojinekeliboro.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc3e1969e5---71234749395.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160711f8bea3ee---95080551269.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be696d0895a---lelebalirevo.pdfIn PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/73940182394.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/49596818897.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/nokaganagurifiwalof.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/95e5d25711395a89d0a43196514b59c7/fefiluneporapinine.pdfIn PDF document text
    • http://greenld.com/userfiles/kagelutab.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/ridisikaxo.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bac44fca814c3dcf04583d1c145b1a65/90007546258.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5a6357df4---79114594771.pdfIn PDF document text
    • http://afslab.asia/upload/files/zajuwe.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/6155521077.pdfIn PDF document text
    • http://falerisztika.hu/tmp/bimez.pdfIn PDF document text
    • http://dejede.com/userfiles/file/69000618883.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/75993340850.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5c620aecb---65473316036.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=cast+away+all+your+burdensPDF 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_off0000bc80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 10620 bytes
SHA-256: a2f90b7e2eff9fb29b2d11ae8932a39b398668a38072150ab6ac5f7bce39b15f