Malicious PDF — malware analysis report

Static analysis result for SHA-256 27e9d0f55e6e3c9d…

MALICIOUS

PDF

67.9 KB Created: 2021-08-20 05:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6293915ab9ad9cb46af94d8d46c98595 SHA-1: bd3412f26cb08cd770c082abb01261ece0c4dfff SHA-256: 27e9d0f55e6e3c9da0841aa7e4b57907ac07f65c792d33ffc694eb6f235c3753
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URIs and compromised CMS uploads indicates a likely attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9059

Heuristics 5

  • 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.
  • 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://laborke.ru/uplcv?utm_term=facturacion+office+depot+pdf PDF link annotation
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8qs3k9fpefm8vfkp6la7d5oa03/towekub.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/vtopp27792tic6idohiapi069s/15979023937.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/2ce97059c7e054baa164782503293005/makemuwimoxopeperexoloza.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/71786262080.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/wadaxibinozomef.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ce8b3e884---5054173824.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/f1bjtqdnhs2m41tg7jgv3ve2k9/gakimowunetominozemitiwij.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/s7sdknmg5n0jdhicfq0aee8o64/zegudojitonovekotalez.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857dd983f47---91172375776.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/famepovola.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/5ad2pvmf7j2c6mshgo5jeoavqh/54293380418.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609882fd85648---20494616315.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tudakelemajaxoketizulijo.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/fimorebitupadibeda.pdfIn PDF document text
    • https://ebooksweb.net/files/file/55420426359.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/bexobarigopudipomubotoz.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/pobipagosigiwo.pdfIn PDF document text
    • http://martonelektro.hu/files/file/27126256262.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b2bd96e8---97128152624.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/67449714852.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/tewoz.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/gibob.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/33785235140.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/panudesapube.pdfIn PDF document text
    • http://irodori.kir.jp/files/file/virijezakawuzerafejavape.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1