Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e850df70407a1a4…

MALICIOUS

PDF

80.8 KB Created: 2021-08-15 22:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c6f1c927d18a209d92d87aac8973bdf SHA-1: ba1a79b7c5cecc8cfeb705d4d1f990afbbebefc0 SHA-256: 8e850df70407a1a48852d0b4471c057981373682b08df52e91de89bb1aa9f70f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body was unreadable, but the heuristics indicate a pattern of hosting links on disposable or compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e339563a5---vekajixixiserobakow.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/u7tofq81eblpgmkel7o5mg9esp/64404610102.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/11601782713.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf604d51f---97124572151.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/39843535964.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/64915278866.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/6249967933.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/7ce28cc92e428d2473f0ba0cdfcdcbf6/55739402259.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8428a5001---78277911477.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffc60520cd---jubufavawerasozadure.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/98999862159.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/998a9fd29c34cc847101c824b6a1d062/dimuf.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/32725151990.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kosisalujajetovajuw.pdfIn PDF document text
    • https://silga.ca/userfiles/file/30352591533.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/vubito.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/kidibakizofagogoj.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/wanediraleditewezujejotov.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d1b86495---68731727502.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95d75267c9---lanisafixa.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3752857b---9645795017.pdfIn PDF document text
    • https://appfacile.it/file/93707822305.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/danewasagozejapirevikemam.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/20083015654.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=harley+electra+glide+classic+for+salePDF 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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFC 10652 bytes
SHA-256: 72407c22a80a269cdba9d85ec4e5dbcd49ed76c9dc729c24aa9f59c15129fe23
font_02_sfnt_off00010446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10446 17760 bytes
SHA-256: 86b8c89af44554cb1ee672d815cc3ef52ec7b8833d1ea9604c181aff8a8badf3