Malicious PDF — malware analysis report

Static analysis result for SHA-256 406eb21f20c2f2ef…

MALICIOUS

PDF

62.5 KB Created: 2021-09-11 02:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f12bd73b98308159ddc3509488727a90 SHA-1: 91e4ce053b3e5da7eba2bfe3cc6e224d3ab1a32b SHA-256: 406eb21f20c2f2ef62f3a43c50b08fe540d4411993a301116b4d061bfca8aa69
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. The embedded JavaScript is likely used to redirect users to these external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6040

Heuristics 5

  • 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://www.ecvbrass.ch/user/web/file/32114081299.pdf In PDF document text
    • https://basisangka.com/contents/files/jajexotojitalomatemeza.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/87991877968.pdfIn PDF document text
    • https://arerp.kr/data/file///zotitugovukiguxosatojan.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210906062116.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/54312466399.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0d09ecd6a---94044814478.pdfIn PDF document text
    • https://rjpexport.com/files/34841697233.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/tugavevutakatad.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/45758287604.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613967a44d470---nodimugodomusevum.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/kixijexevejes.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b23ced9e24---62542968476.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2a76fb0b---sibutixotonubimujavonen.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/povuwonokol.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/54581088850.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/32370364831.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/vivixobalegazijage.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/32658932134.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/2885001229.pdfIn PDF document text
    • https://pernambucoimortal.com/imagens/files/25649191503.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/87536467105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+is+a+vcard+on+a+cell+phonePDF link annotation
    • https://lapdonline.org/file/lonuj.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/25297199295.pdfIn PDF document text

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