Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebdb97bccfd42d77…

MALICIOUS

PDF

82.4 KB Created: 2021-06-17 11:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fb232d7c4f3cf4cd9d9eef352eefe2f0 SHA-1: a5a1240f2e31cab499594b6ee88408dae49aa537 SHA-256: ebdb97bccfd42d77a1f166ec50b69f150e42dbfdcfc57047f0c5adbe732a246e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous external links, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=digimon+adventure+season+1+torrent PDF link annotation
    • http://choinka4x4.org/cms/files/file/77418199065.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945588d8472---fedabomomozevurulenap.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/6552464340.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/94712ceac9c55391281bb2103de195f6/bisevaga.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/5bg5qheodt1phksmjiblk4b8nv/bojetulivadoroxegev.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a743b5427d7.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/3eklngfg333u58pidpr2nelsb5/woforakapaminenoxefubad.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4abaddd432---84122510777.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/mazutedatezapupu.pdfIn PDF document text
    • https://brs.jo/userfiles/files/69922070038.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/31937718584.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/72898548326.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/5ffccf0b9879365d8db4734ccebfd12f/90695452916.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c524d2d2790---mabixugone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 4680 bytes
SHA-256: 23bc6a5fa76321bd3bf6f67c080f86b4e20f8743b8da430168bd4dcaed0c3521
font_01_sfnt_off0000fbe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE2 5224 bytes
SHA-256: 267dfda34bb27309698bbea5aef2ffe129c93636f2210ff2bdb09df5631848bf
font_02_sfnt_off00010d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D98 1596 bytes
SHA-256: e80d19f9f3f4c31a7d9518ca1a1cba1f35fe906d77e6bb57fb947f89c2d262bc
font_03_sfnt_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 11272 bytes
SHA-256: 015aef8da1c3cc7735f98fbcdef79740d59192c19a118f9b46d1721b6f7fa56a