Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef74b557fa6e2561…

MALICIOUS

PDF

48.4 KB Created: 2021-09-03 21:18:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 251c277d4ae4cae266a6788b1d6ff4eb SHA-1: 4108f560cf7532e24a44411776842d6399871a9a SHA-256: ef74b557fa6e256111c8745c9355264d0c864fb24ce155112da4cdba1191f996
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier further indicate malicious intent. The document body is unreadable, but the heuristic firings strongly suggest the PDF's primary function is to act as a lure to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9210

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://inwebjor.ru/uplcv?utm_term=que+pasa+despues+de+la+muerte+libros+pdf PDF link annotation
    • http://krasneclanky.cz/uploads/tozitusojujaruraxatixos.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/dabojebugopedadulaxaxe.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/nowurogozufogimoferex.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4a4e7e113d8407e9c0eb6146492098d5/25247706283.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/7fa70793bc3b4d520f16bdb86e1563b1/xizerupuvefuja.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/79551769248.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160de7da6c922f---raxaditubidofaj.pdfIn PDF document text
    • http://hill-macktribe.com/clients/7/78/785e88641dcef8d5cadf71fa969cae92/File/xosufifononomere.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/vugedenumolijaroxeni.pdfIn PDF document text
    • https://cambodiaangkorhomestay.com/userfiles/file/rigawuterezarirur.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/ubih2f4aa9ges3l8qnh7go1ibl/vujujera.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4616c7bd13---37765972703.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/25324772142.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f4d23738---47264205860.pdfIn PDF document text
    • http://altinay-law.com/images/file/25692698849.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/237218194.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/b9da3165ca6aa3a4af0ffeeb647b64b6/68136195945.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/venomoxukulakofu.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/vn4c4phi7e1sllri42df74vvfa/ridada.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/tpe5e1e1c469ac36q25pmlhl82/filipowo.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/xoretemawufetazoba.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/m6a5v9j5rf0pepmdusq4jqsbn6/51713514995.pdfIn PDF document text

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