Malicious PDF — malware analysis report

Static analysis result for SHA-256 35884392a7edf473…

MALICIOUS

PDF

52.4 KB Created: 2021-09-17 01:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdfbf6fc3949584553d1b51ce624d1cf SHA-1: aab5a8faedb892d4caa6e37139f837541152c6a7 SHA-256: 35884392a7edf473e63dbf38f5b0b356a009a4c052b3190e3d1298f4ceab9f58
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further compromise. The embedded JavaScript stream suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8382

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://alt-1c.ru/userfiles/file/12460695565.pdf In PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/c53e2ff27c9d3e08aa4d09392de540f3/23687678191.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430c6f4e963---sinediruletix.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/50434015890.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/limusuxesomu.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/83958260747.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/40284752223.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/ninakazabikotudidelojug.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/39893735879.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/25603532048.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/614040818f91e.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/72322498017.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109170103151498.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/bedojexo.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/20827379413.pdfIn PDF document text
    • http://bandbaajabarat.com/ci/userfiles/files/pefog.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353e719cced---rexipapedofulazebinir.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16137ec190d704---37152940719.pdfIn PDF document text
    • https://ixiu-23.com/uploads/files/202109152251426218.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/n8s924qri6mqbsuvfd16sm2d45/68057210697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stephen+hawking+accomplishments+listPDF 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_off0000b1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.