Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66d469419bdf247…

MALICIOUS

PDF

84.8 KB Created: 2021-10-06 13:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3230215ce08c9db11592e78c836eec1c SHA-1: 91c5b8c617eb426ba0a33dd8f5ab806f00e845e3 SHA-256: b66d469419bdf247d2d80f3d666e433faa4f85b2b9391b7c82ae0b7d40951d43
172 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of JavaScript indicates an attempt to execute code, likely to download a second-stage payload or redirect the user to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://bfr-bialapodlaska.pl/userfiles/file/xewuxapazefuviroxamizo.pdf In PDF document text
    • http://hanleyresources.com/images/68744226000.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/wexusexagovixemafujoz.pdfIn PDF document text
    • http://healthywithhart.com/res/file/nizodaz.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9e50e9a557fd568e999a13099ec1c867/xojuwuzegilelubofed.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e6121bd0e5372596243790fd971e5cdb/xisifipif.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161596795960fc---sumovegarubazokizirep.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/to9a8spik6s79slpf2mjfmjb1a/18239899992.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/69395232800.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/72670308051.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ca9d76ba7633bf1cf8471430093226f7/45830907973.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/90996560350.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/77856773184.pdfIn PDF document text
    • http://tetobox-budapest.hu/uploads/files/kovex.pdfIn PDF document text
    • https://pilot-nav.com/ckfinder/userfiles/files/rezuvarajinomefelugixaga.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/43555754815.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/71265048765.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/8720b097de73c610fa20a1118f572f1f/zijomuwilifikel.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/1714367432.pdfIn PDF document text
    • http://hingliltd.com/userfiles/jubuko.pdfIn PDF document text
    • http://scpt.it/userfiles/files/pigowapimajegejul.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/53299903031.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/wusefazabusivovokev.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/kipiminolifad.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d5d713c6e---79657570392.pdfIn PDF document text
    • http://mcutech.net/files/67465519549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=1000+english+collocations+in+10+minutes+a+day+audio+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 11300 bytes
SHA-256: 485fcbfe2352c83939e1a68b9e3d3aa3d72632a851669fff73dab4fea132c1dc
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 21148 bytes
SHA-256: 627ecfada9d3af53abc59941664b80d27f256974906976005b12d76c7bd0a90b
font_02_sfnt_off00012cd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1