Malicious PDF — malware analysis report

Static analysis result for SHA-256 862d74c9652e296f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-23 03:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15737f9283d67c3593582a76e5f8a594 SHA-1: 87a1ec3a13322a84a7d6d66032292f77d9726dc3 SHA-256: 862d74c9652e296f0e6f242b90a9dfb69c4f78f6c97574e300f53e02e860abdd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories. These links likely serve to distribute phishing content or further malware payloads to unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://huntic.ru/uplcv?utm_term=galaxy+s4+ir+blaster PDF link annotation
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/c52jdhpjbd088stspc6lvrpf1p/mobonuwutegewetawe.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/73359483818.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/e8fc2efbf30681e8e436e2c5dad84463/riganedumidazusukamavan.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ec9cb34afb311657a69d820780dd41bb/zogejomofepazujomazopo.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134273ec665f---56679207147.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/61184894167.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/91666397744.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/12066058674.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/xiwagodawanapafosudow.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9218b32b60e7298ec003f7985b10b922/36136585882.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/49085857334.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5dc5b216e20d8e6a37249cc1fad66d1a/vugagif.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/96729744228.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/fijuzatimigagunujuzuso.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613030ae65d88---3059018901.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/48808593380.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef936c1e0f---16880469870.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/muregum.pdfIn PDF document text
    • http://trieuduong.com/images/Download/71717627924.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_off0000b90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90E 17876 bytes
SHA-256: 64ef548d6c95caf30475e16448478186904841ac481c16f7676d65c010804687
font_01_sfnt_off0000e811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10028 10352 bytes
SHA-256: 2bfd7a4e2dfb3b0c5fdcca268ee178539a566e96a0a42759f0796f0f056eff06