Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f4dfbe44558ae4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-22 12:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d1dd1bd3ec474364d4c4e926d475a31 SHA-1: 6653c7b5e8a5459229e92b8e445a2b261969f5ec SHA-256: b7f4dfbe44558ae4192bca9affbf88d3bf8f6ca0c7f0d8534df897c4d4b78b9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. These links form a link farm, likely intended to trick users into downloading a secondary payload by appearing as search results for desirable software. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=omnisphere+2+mac+free PDF link annotation
    • http://qualityspices.in/ckuploads/files/vafikevezidebofibuteluluw.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/10781092781.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/fikamips1q1sr285gloihjk193/rujiruxoluzaf.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/1477235134.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/80921818223.pdfIn PDF document text
    • http://104408017.linker.tw/files/losoridurovojaxunewonifi.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/7947471815.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/vugegi.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/tivelebojiweludurab.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/tatolanobuto.pdfIn PDF document text
    • https://thebookonpersonaltransformation.com/FCKeditor/file/80623483396.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/zupasisoxagivapakez.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/kovutivapoxos.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/jikataziguwaluxawivebek.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16143f49134d3b---kesofagiwe.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/kimajufuwovexifomu.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/59446994985.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/46841722462.pdfIn PDF document text
    • https://kratky.eu/files/file/64891480800.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/worozegowinamibiwatamoni.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9aa8cbe77---25843883017.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130a0d909e6d---kisivigoxipo.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/vuvozaxubajifonedoneto.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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 17056 bytes
SHA-256: e557b7278eaa659c41148c6b60b1b4912349ed1c8b665f7a12d6aa89a2f066d1
font_01_sfnt_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 10624 bytes
SHA-256: 33a0c781ad8af1d77669c0ef523860f939c92ee97f9afb5c59bea8a6938dfea9
font_02_sfnt_off00012286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.