Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2addeaf4c70d7e…

MALICIOUS

PDF

56.7 KB Created: 2021-09-07 19:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ff3bed6f78951de986bfb9f40d7fbbbe SHA-1: 914cc7b5c0091bf578cff21750bb1a5a180dc92e SHA-256: 8b2addeaf4c70d7e6af1218c9831586328ecd0f8cbc6a5c151d056dcd129c447
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript further suggests potential malicious activity, such as redirecting users or executing further exploits. The ClamAV detection and ML classifier also strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7557

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.
  • 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
  • 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://timavoshipsupply.it/userfiles/file/lokunulisorov.pdf In PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/tuxemifipixaxugomuxo.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/84828361406.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/pifanabuguvuxuwunaresoraw.pdfIn PDF document text
    • http://3sdent.com/upload/files/kibivokezuz.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/rolobezuk.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/domotanib.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a325589269d---80689651035.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df3219bbf5a---vavunakedetebi.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/nokawitosikepizol.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128c3d64a11e---xubotawisagev.pdfIn PDF document text
    • https://liffeyartefacts.com/fckimagefile/file/losusaralugetaliwevi.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/5339bf29f9d3bce4cddf4dfad199206e/95794974151.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/darupakiduximererolu.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/38808179043.pdfIn PDF document text
    • http://tnshoppingbag.com/upfiles/file/26463643294.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cb4babaed---29802272387.pdfIn PDF document text
    • https://service-panev.com/userfiles/duzel.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/zonawi.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/gijukijotedos.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/xugamikavaforexij.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/zazoxadefafixegifazesavof.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7661f0af8---23885525345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=prensa+manual+para+farinha+de+mandioca+pre%C3%A7oPDF link annotation

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