Malicious PDF — malware analysis report

Static analysis result for SHA-256 913bc187b2f568e6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-15 16:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e64d21d5f715d1df3c862097fa0a9f3 SHA-1: 68558b6d1ddc0c3c3a232ef879c85b50d7e8537e SHA-256: 913bc187b2f568e687f6e6ed456e08315ca268444fe840b86405119cf65c101e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

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 http://novena99.com/uploads/files/202109140617283445.pdf In PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/42837291582.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/kogexelopabijavovuxi.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/24220373872.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/63141926521.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/xujaguvilusijemoruko.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/tivakodatoxurewo.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/58893444665.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/6136bc8801f0b.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/951efaf0b486002850def2d3511173e1/gukupopomekawaf.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/93735826135.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/78016800793.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/laroj.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109090955176440.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/76239685874.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/6ca2bca9bdacf578b65c391be322ac04/wafolixuni.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/161379b29303a8---57443705413.pdfIn PDF document text
    • http://wdnederland.nl/file/kadanuranasidipa.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/rajefizof.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/nizix.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/gf90etc983fao22vb14ml3jjfb/18233480102.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161404ef78573c---66286688483.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/9002345557.pdfIn PDF document text
    • http://artediapharma.com/upload/files/pisibozerogapezotajerizi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=female+names+in+iranPDF 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_off0000bdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB7 10028 bytes
SHA-256: 225b334c643833baf50fd4314d6f48c4d8d2da2073d163f6dec9db8de7e98dc1
font_01_sfnt_off0000d3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D5 16524 bytes
SHA-256: 94ab94c649b9645f5dce855d170bb4dbc602c156ae001f9df4de5f3df9d15648
font_02_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1