Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2787d933b665e20…

MALICIOUS

PDF

117.5 KB Created: 2021-08-07 15:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 1025e2b78ef90db8844ebe214d734ff5 SHA-1: 74b0f2a4f5704ac3f61785f534d5264554234247 SHA-256: f2787d933b665e204cd97eb21e4126b5a3e95bbc9fa979ee01554b14c6356b87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. Although no scripts were extracted, the PDF structure and URL distribution are characteristic of a link farm used for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://heyratacademy.ir/file/vegasogipibudujujoxozozer.pdf In PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/a6413e496b1a6281cad5f803a1f0a5fb/ferisuze.pdfIn PDF document text
    • http://www.asslar.de/downloads/87633247153.pdfIn PDF document text
    • http://aqs-group.it/userfiles/files/nusofosevi.pdfIn PDF document text
    • http://short-story.ru/upload/file/mudadutuwusago.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/31c607a5a4509b74d2e54b25e373adbc/rumumamo.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/10b7aa2ffdaa5d28061e58d7d3d7f37a/90086720843.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610bcf76c31fb---46650037497.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/8954590512.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/37246924467.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/03v9rst71sok1734d974c9kfsd/30711947103.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebab1e98f4---vafovufanodede.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/bofenojixag.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b218d42e---68528333414.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/43251639312.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f98449bfc11ed2b7699f2f29ae32ccbd/10509366773.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096c87a7f245---foleme.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e6376fb33---10025043649.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/tamunufevutinironevotisok.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/d68cb24a9e05730095388c00f9eaf072/19648199181.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/31491456da203fccb3c7dbfdfeddfe20/xodetodefoviziwezuvut.pdfIn PDF document text
    • https://norservis.com/files/files/10063817877.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/44773643275.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/6349140912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=marquis+de+sade+juliette+bookPDF 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_off000169d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169D9 10736 bytes
SHA-256: 01b5971a5d60f3e4a169be90a00cfb63ddc125304f3b6386a692189d9809564f
font_01_sfnt_off00018268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18268 17720 bytes
SHA-256: 0af89079a521954d4f069e3dcbfeb4ca9e2fe8c2b0456c502eb8f14662194cc9
font_02_sfnt_off0001b022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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