Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c551826e678cf0…

MALICIOUS

PDF

77.6 KB Created: 2021-09-08 06:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c3013152d31dd3901dd1d5f7ea9d1642 SHA-1: 143a3ab9bb411af64a1d49ba6b9df1e8caad0c7a SHA-256: e4c551826e678cf0ae36b15e3c425e47ff857f99082090642e8e08eb92a3a008
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as 'Pdf.Phishing.Trojan'. It contains embedded JavaScript and numerous links pointing to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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.
  • 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://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/volutugugubonowepavuw.pdf In PDF document text
    • http://iehyun.com/editorupload/file/22301781186.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdc49864e7---17326868204.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/kovunupuzaxotuzitiveku.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/livozovabevurutolaxowibix.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/6329837249.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c974497495---87574615436.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/divepil.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f24cef1f4---57211655962.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///judozemosokegegisulixeja.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/3813280214.pdfIn PDF document text
    • http://ahchala.com/img/file/kavapazamakuxufut.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d686dcdf99---5162131652.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/11745691647.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909df478d13---64918892019.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad59056423---vozuxetesivubefefo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ef33aac6f---jepas.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/20009070837.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/kunagap.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/beduvepoduvaruf.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/59966338370.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/4560e3017e4e1129f7ded086783aab51/95212879288.pdfIn PDF document text
    • http://gibisch.org/files/files/lituseram.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c652a0b69a6---1293594941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=triple+beam+balance+worksheets+for+middle+school+pdfPDF 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_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 11164 bytes
SHA-256: be610781da029ca82f0b94bb09579851d01224f05337dde1de97e8f3408c9778
font_01_sfnt_off0000f973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF973 18628 bytes
SHA-256: 71c8ef97fae0c6a17c33a0088a5c9db525f0ea546e9fa56c0b3706cd794fb0c9