Malicious PDF — malware analysis report

Static analysis result for SHA-256 79856ba7bdcae683…

MALICIOUS

PDF

57.1 KB Created: 2021-08-28 17:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cc481cbb3d00495f1ae0b1aac8d564db SHA-1: 741c13109cdb1509342d1569e44727dd84f68142 SHA-256: 79856ba7bdcae68301f74f22ab8641fb69b7f1288987c58387e0b5f32e318095
64 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to websites hosted on compromised WordPress installations. These URLs are likely used for SEO spam or to distribute further malicious content. The heuristic firings indicate a link farm strategy, with many distinct hosts and disposable hosting patterns observed.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3863

Heuristics 4

  • 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
  • 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://catamma.ru/uplcv?utm_term=expensive+sailing+yacht PDF link annotation
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/n1j4anhepl6hsl60s2b7f3n76n/60604954156.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gemimaxelezujusilovuxopa.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/f8464519719f2972b340a4efac58d42d/30812386482.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/todon.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/foxagalavugiremev.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2ee83ed31de10da5912baf3a2d67417e/fuguxojolimevaru.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083485006510---56921647758.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983a0fa5ba5---82447317822.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/77283807209.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/98473275089.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/20161954692.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/zijutilerepanilukugamuso.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/nirixusi.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/wevigilogera.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/92681130845.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/cf74222d7958f878b78da808a7b7f580/68628392740.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/ivlskqpfim2kch23o3h3skgk8d/sinaxakin.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/91723709653.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/37271803155.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/73415675620.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/24008016709.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/36163265809.pdfIn PDF document text
    • http://sam-global.info/files/file/69124721261.pdfIn PDF document text

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