Malicious PDF — malware analysis report

Static analysis result for SHA-256 098cd97eb42f2cd7…

MALICIOUS

PDF

125.7 KB Created: 2021-08-15 01:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c131c4bb00a8f5bdb347b1b7c3cd72dc SHA-1: 6f464095e55baf18794742b7a21dfed3dcf6af43 SHA-256: 098cd97eb42f2cd7e4fc6ca332c33225a29139ef116a5887b3f8a0f634f287be
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final destination. Heuristics suggest these are part of a phishing or malicious content distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4841aba0a---1550125559.pdf In PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b35671a74---78561191258.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1f9177b86130c02d4c3a2ba1fcf4a725/82482350847.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/xefadizapabeji.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/12682171474.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa62e2272---85170429135.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/niwevemebuko.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/67693016851.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/c69fdd81a732b695e4f4346f3a5dcee5/84907527826.pdfIn PDF document text
    • https://nevisnews.com/userfiles/zujapedaziwufapegagimaso.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2295ad40a---20664079703.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/dituw.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/49906298138.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/wonerubese.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f674c10142b---15906431091.pdfIn PDF document text
    • http://amandamaitland.com/images/file/12019409454.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/tavijirafaxidomi.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/watufavujoganinavezum.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/25101985772.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/mnnc32d09u7vue8t4migaoqt8f/tibirororidisegusimitew.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160712d5016802---munapubijusulologajeladi.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/favebasulugusupopilix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=conditionals+rewrite+exercises+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/962e3cce4ace479a345bd34c17ba7e78/63601442618.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_off00017a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001924e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1924E 24604 bytes
SHA-256: 211992ae35719c524c2c6f32daec8aca12fe353339763de8fa3980c6f7f8669e
font_02_sfnt_off0001cfec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CFEC 10832 bytes
SHA-256: 09d20e5e0b5a675f60e3327599896569be028f923ba23ddfe262c30d3873a3c7