Malicious PDF — malware analysis report

Static analysis result for SHA-256 214877c7f634c6fb…

MALICIOUS

PDF

85.2 KB Created: 2021-06-28 18:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ad0afd72aed489084f92cbb5085cddf7 SHA-1: 392f1f77f7cc7a7f410cf30a37c2797d9b40fc1f SHA-256: 214877c7f634c6fbc72f788356fa4ae26983d6dbf6f6a066fed62126a7fb24df
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, suggesting it's used to redirect users to phishing or malware hosting sites. The presence of external URI and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://ketchas.ru/uplcv?utm_term=class+10+english+chapter+5+refund+question+answer PDF link annotation
    • http://reelproductionshd.com/userfiles/file/63580492767.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077151ccedc9---fagetewo.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/sfmaae06jgpvgfpoh06c0q8lr1/sitofesagavafe.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4eaa18dc2e8de049b24c2b978b9f552d/xoraza.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/566b00a4cbae62266417562305214d63/21104034514.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160af945a447c4---89293034941.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///50272049123.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b51859ca62e---82401013887.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/pisigujaxavinub.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/xubagoxanibowupin.pdfIn PDF document text
    • http://pi-consulting.ch/download/43542227532.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/kuzetatiluwodelanokalara.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160982c09a10b5---69336179213.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/sabananenodeva.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16081bc1e23188---15195725212.pdfIn PDF document text
    • http://lbtech.kr/upfile/files/96590788687.pdfIn PDF document text
    • https://akvaguru.hu/user/file/63831769668.pdfIn PDF document text
    • http://amdind.com/userfiles/file/bimigolopelegubin.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075008146a93---susigifefegadevu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/642d2c1e19cc64e25a546228f803a31f/58016405123.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/73268249276.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/81772446364.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/67153953026.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0e762efe5---92824831412.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f8250232b---40259168872.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_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 11572 bytes
SHA-256: 2eed958120efe9e59f2d857d0c92731d6770efd5b806f5e76ce8febe5e6cbc04
font_01_sfnt_off00010082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10082 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 17300 bytes
SHA-256: 787c7d66abb0ff33ca4033206cfa1cc392c5c879eb81afda14965b6c4af4ce6b

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