Malicious PDF — malware analysis report

Static analysis result for SHA-256 d045b0eca5e14c56…

MALICIOUS

PDF

84.4 KB Created: 2021-09-23 09:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 84eccc1759ca36dcec26958bedc30cce SHA-1: 1ba21ba38241e83f1be3ff9afc4dd7c71608b711 SHA-256: d045b0eca5e14c56a2b14a03120e5fec0067a8ca4fb31b34a3f5f2adee524d77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users to malicious sites. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phishing lures. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://marine-inox.com/i/File/ranevediv.pdf In PDF document text
    • https://nppgursaraijhansi.in/ckfinder/userfiles/files/76203593201.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80748511696.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/td7fjqcait8t91cbig1so189l1/34096882625.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614388103d41e---79213669949.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/savepanikamesuvawer.pdfIn PDF document text
    • http://cecev.com/stockages/files/pipidew.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/27872156899.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/7172312540.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/0e6f850be4cb0e281844b6917cd4ee76/gufeke.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/puvikiwolerewenu.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/66450671241.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/pitivejasunika.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/b47a1b21a134a0910a8205538fb8bd89/zegiwidifogeseresimuguzok.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/warev.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0f927854c0e9716e5dee5affb61ac695/gifunogawegusodabiperug.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba572a9665---48522524835.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/69392158672.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/vidogazegafup.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/94839209556.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload/file/59766244903.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccfe1a84f241fc2582440a34cbc108c5/13284069015.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/kuvunoxegilobuzarowusip.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/71646793770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=straight+on+till+morning+a+twisted+tale+pdfPDF 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_off0000e1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C5 18344 bytes
SHA-256: 016b209b1d19f5dd5def9669611a6a7c8280c8489e3b407ba0a0e76244537519
font_02_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 11104 bytes
SHA-256: fc4622ae612ac01e45e1cc5743e6086657c1d78632cc214415dbcc64e4c6a095

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