Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6f88c9388505b3e…

MALICIOUS

PDF

83.1 KB Created: 2021-08-19 19:42:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9972ff5fba87e9f683234b6b518865b0 SHA-1: fc4d7f00c2b2f1e930db63ea2cacfd8d2f0fa468 SHA-256: c6f88c9388505b3e830aff3b1ede2a8e2d45acfcce4f617771bace4c01f9fa9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploits vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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
  • 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 https://huntic.ru/uplcv?utm_term=how+to+connect+bose+soundlink+headphones+to+ipad PDF link annotation
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1038b523929d67027b214a03208f977a/biwoli.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b40ae08bd00---gekumetubuwenego.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079893ca68a7---76730327920.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9e7237611b009cee602e96849b08ad1/8421603892.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8c3979bef---49259262161.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f2f585211c88f577ebc99212817e76fb/muvesojodepubigepokitu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/debomolobujijujot.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ab0b6082fd41af59733476f3dc341a7c/wefipudok.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/48606644656.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/1963424897.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/gitorapediloluxajimibikuz.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/joxipiwugudenukamaf.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160838b0811f3a---39032532725.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5i6sba9fot6loqf6vnqudc4hp5/robakegidujuve.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0525d1cbc6---69774940827.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/556532446.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/b3c3088470cdffce7a2f5e3e85c931af/36262519452.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/63838283191.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16102f7da9446f---niwaranigafifiwoxi.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/17281601319.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/1646b503d77f2b2dfc714eea2a559ffc/72820498493.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a98310ca---86608032954.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/43030573463.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/dobitajulufomore.pdfIn PDF document text
    • http://www.sainteuphrasia.com/www/js/ckfinder/userfiles/files/zopidobavuxomusezobu.pdfIn PDF document text
    • 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_off0000e11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF933 10920 bytes
SHA-256: fcb680bc9d1956d5564f39366186d91770f4b46d324ddfd958e7a35f15d4780e
font_02_sfnt_off00011235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11235 16536 bytes
SHA-256: d5d7f33b1ae876d80c58d9c359aebe19ff0044e55dd72255affd9f8e4ea184c3