Malicious PDF — malware analysis report

Static analysis result for SHA-256 7986586e8a334d17…

MALICIOUS

PDF

82.5 KB Created: 2021-09-15 19:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8de1585ec05c2e903303c664458221c4 SHA-1: 6dfdc7bcd2eb579885363310543c3c441322eed2 SHA-256: 7986586e8a334d17721be6922ed419d987e318c0d41d2b5a6e12d696317cba30
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://godsownproperties.com/userfiles/file/5566694194.pdf In PDF document text
    • http://phuvuongcorp.com/luutru/files/fozabodafuga.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/13105432296.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/41946738405.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46ca97c96---99319517495.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109050542201443.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161383a3b662ee---87937725981.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/pitupuvimunokazina.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/xinovixogukidadanogu.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/j9fauffjarmfag4h7al7massjd/76767135126.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219574442276.pdfIn PDF document text
    • http://centromp.it/userfiles/files/xafikol.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/1af1bd4233d62f3d5d85df4b5d5b44aa/zifegubatogela.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/07f4974ae21727ee501f9674a3c223c0/gilidowitiporobogenemugu.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/pozironu.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/42980609342.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/89747571318.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/1c67f4d3701ae4b4e743180c776691c6/87184123404.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/71834087953.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/37853036486.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/pivizimibapo.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///63413798563.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f59ca25f0e---tamapijaxigij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=clicking+legends+codesPDF 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_off0000dc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9A 18848 bytes
SHA-256: f7a197585ad58cf3d39c888e8780e2a5c217d7ae2d8aa06153ffff7e4f05d783
font_01_sfnt_off00010d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12569 10308 bytes
SHA-256: 6e0a2f5c6cfb7f07d107a1e6440591dfc3ae89946e1d61690dcfac85ba84aa22

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