Malicious PDF — malware analysis report

Static analysis result for SHA-256 f53fc2f99c9fc8ac…

MALICIOUS

PDF

58.1 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: 11765f471d6169cd3b222d3882e4ca9e SHA-1: fc3374da5c29743b04a01790daf40090c01b0337 SHA-256: f53fc2f99c9fc8acdf0a6185b3ce795e46e98e8b6e42f02d31a0faf4312b04ca
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous external URLs. Heuristics indicate it functions as a link farm, with many links pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9261

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
    • 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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.