Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc53c29fb1f13c03…

MALICIOUS

PDF

82.7 KB Created: 2021-09-06 08:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7db4fb635df1b3a941345840782f593 SHA-1: fc58cc3dece032f3d8dc1a92b9a9f0bbb761c532 SHA-256: fc53c29fb1f13c03a11e8d7eb52fb1f20c68c15ed088ee91d5cc2ed657236a39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://genegurumiraclehealer.com/userfiles/file/63009457622.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/7m8lu5f92mq8kk2msj3d40v3q4/netafidexovodorodifebamas.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/wigafukikikov.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/38175516151.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/93410248651.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/tibelulitupanisexat.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1610cbdb394090---12063599448.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/vasakaxoxagujenogezafiz.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/wadewuweve.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210905054832_577825575.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9fcj1j09501pth24rlphqtv6o4/foxekexosuveguj.pdfIn PDF document text
    • https://postelezmasivu-plzen.cz/ckfinder/userfiles/files/18927372107.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a950bca246fec24c184be1586cd8c8a0/47593713125.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/ragerawubevuku.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xakenumuv.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/woxumopopana.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/90650899792.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894746ad2de---73423068547.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/jv0g1ai4pbjsas52k0p9fli8db/takurevigi.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/dbdf6d1a6595e5ffdc1c5515090f0f80/12813571446.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/gok6n8ig0em07s52hmtbsfrlv1/98925047152.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/loleviderutudijageriwodo.pdfIn PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/jefunirirutemidubetop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=licor+de+mandarina+pdfPDF 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_off0000d84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 10428 bytes
SHA-256: 7660342bf8e154cd52a2dc28dd351887960bce624c201de9ab3d6d35f42bfdd5
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 20604 bytes
SHA-256: 1a96ae91df053d0c57720e5492f14ac3778948b018e77e8629085a37e6f7564e