Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf228e474c230cb5…

MALICIOUS

PDF

40.1 KB Created: 2021-09-05 21:50:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4b6d4133bbf6e82e5275a5f5b31b6ee9 SHA-1: bbee0a61b4047ee897bfb68dd26d9e0a9475840e SHA-256: bf228e474c230cb54051f7617d909ecb1f54324de8c16e28b712bb91f7c05d1e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is structured as an image-only document with an action trigger, typical of a phishing lure. It also features a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or redirect users to malicious sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9416

Heuristics 6

  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://giftboxvietthuy.com/upload/ck/files/jujomixunesurude.pdf In PDF document text
    • http://metabolit.ru/files/file/wibenetuzovekowa.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/nbuossrhbj51t1g1ilduffo890/migogejarirajajir.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/lojobexuniz.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/56dedb6abc2405248a9d2667656c4602/nomagexipeposurego.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/35656745218.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/62118936609.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/3613622051.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/65083197369.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/susawusabiwinemuxomepek.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/92959165620.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/146d9437970ff8827dd9aeae3a78848a/32762812791.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/lasotujodozoxoginewijo.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/61971079967.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/4234515257f0bff252ad2a8d0ccd7111/kigonuvabadajo.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/mobemabudap.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/61705685149.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/f8415301018eefe2f7f6f6ebd53342db/famuso.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/47269904540.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c902dde1188---depudegotipaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=basics+of+air+conditioning+and+refrigeration+pdfPDF link annotation

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