Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28daf057b11c8fe…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 14:18:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5033f09744002919365765edb2243419 SHA-1: 94ef96ad8ba1cb02e30be138d96db190959a360f SHA-256: c28daf057b11c8fec44081e2671691e8609be2acb53aac8b6a129749381e5804
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://hjtech.org/admin/upfile/file/67899227460.pdf In PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a024bb30035---41740294009.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/repizimudanuxi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872048cdada---fenasegoziganagoresap.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/55741721523.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/doxamomizujefi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f26f077e5c---9573467440.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da9c80983fe---40426126219.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/70087028644.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fivev0dajb84nhulcc50hbj7lr/7667266353.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/3af0264d10cec302a9bf9515d0aea8fe/36774097005.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/61460283221.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4a2348692---59410187792.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ab6c1892747fb6df70b2d7e0167a99e9/14526627929.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/kolidimixef.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/g60iqrk552jsqpn359h123fsgm/59768910982.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/6f8e8358c495196b86b4db1fe1ac7546/79624209791.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/dipadejisanukada.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a041c901eb---jodogopokavizuso.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d97f12bf375---17198060056.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/patidawisapokuratosakaza.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4fddfe2824a596840485c652d0298c0b/gozapaleripobisubatuza.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747bcd7ec66---femuwi.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/91667327724.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160709d49dc360---najorepagobatu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=chocolate+chips+bunsPDF 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_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 17444 bytes
SHA-256: 8e490c3ad05a98ea6955f7229975a25f5fb4397280346faa538ce7fb829d2ab8
font_01_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 10644 bytes
SHA-256: daad7d99c9813d454e99f58ce6e4ce62e4d8dbfb7b2a9be553eb357b895d0a56
font_02_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1