Malicious PDF — malware analysis report

Static analysis result for SHA-256 4196fb0fd4ecb2b3…

MALICIOUS

PDF

49.4 KB Created: 2021-09-07 23:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6cf4e65d3398aa82d3df1dd5e630ba34 SHA-1: 07f5ce763fbf703adf504a06ecb4a558d6138d96 SHA-256: 4196fb0fd4ecb2b3ccdab289fcab8ef2c3f75f29ef5be4c3f48bbf1524b4e6ae
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The primary purpose appears to be redirecting users to malicious sites via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8005

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://krisoc.ru/uplcv?utm_term=tradutor+de+livros+pdf+online+gratis PDF link annotation
    • https://acronimocostanzo.com/userfiles/file/72772764318.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/butivuvodimopulibaro.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/3231989719.pdfIn PDF document text
    • https://hse.tw/upload/file/67554059913.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/47262731680.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/mituwuzitonudusomodew.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/zirutuvowexapulu.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210704180852.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/98261175863.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/64073592844.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/daziravimelava.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/kuxusezalozudelole.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/0qvrq2clgiagag28hc9100q9e4/nononozasajupavan.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/80217370118.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d1c1196e87---migexorigeko.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/76585736792.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/kinadixawominota.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4e8b32114---74177007566.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/62a9c06338b455cb1832baaabf841340/nezopilurinitexifilov.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/rarojawapetolagezogemi.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/nidanudefebibulaxiwipiwo.pdfIn PDF document text
    • http://i-dron.cz/data/file/duzapukironowonexiji.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/vikusu.pdfIn PDF document text
    • https://actorconseil.com/files/file/nonigukajukadokagufur.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/d8fd92e2f85decd5a5f694501fd565c0/61680490318.pdfIn PDF document text

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