Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99d84e063cfa3ac…

MALICIOUS

PDF

39.8 KB Created: 2021-05-30 19:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7684d1da9203696e06860b39ffac8b81 SHA-1: 7f1adb08512fb11770a8e377b0aa27ec14d2cc4f SHA-256: f99d84e063cfa3ac2209031a6b5d2fdf4a2b7da8b6661b6e61c60c50c059ed9e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8362

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
  • 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 39 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.
  • 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://drafthe.ru/uplcv?utm_term=gypsy+vardo+wagon+plans PDF link annotation
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/cf0015d501aa854bdd156cc39938d99f/40549917138.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/28667df6911ce487e64ad33656cb6fce/lijusutunuvokafavebuxexo.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec4c114d97---45081699321.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d614592f---54987569356.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/e9b4c6b24e539d22b9030f089cf37028/zetumaloxa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/rssvb8ean4hmjqnb64e6odte9p/2016244879.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/47452283532.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607204ec698b5---zawopixusuruvoselegiburi.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8e4d8efa6---4334305622.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/sezopomolumimefunukusoru.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/mipojewivadedol.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/lomobafelarunijisarobofa.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/wojuxi.pdfIn PDF document text
    • https://biocoils.com/img/file/susovinukinexebaliwukova.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160786a05ca3e3---56110593017.pdfIn PDF document text

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