Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35f99cf6cf1f8a1…

MALICIOUS

PDF

64.0 KB Created: 2021-09-18 04:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10d8241e50a372e2c89c7c99302a5e4a SHA-1: c1a1cb73e5ae6276243629dd72407ea810fae3cc SHA-256: f35f99cf6cf1f8a15e9994306966b6ee237b1064d582ec197ab4a735182dbf8e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, indicating a phishing or malware distribution attempt. The embedded URLs suggest redirection to compromised WordPress uploads and other disposable hosting, likely to serve malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7446

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://krisoc.ru/uplcv?utm_term=baixar+aplicativo+whatsapp+gratis PDF link annotation
    • https://gegeny.hu/uploads/file/84520765416.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16140c54bd793e---42374016061.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/81377742889.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/tukejubebetejotenatuf.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/lipikizimipijofawefizap.pdfIn PDF document text
    • https://migger.dk/userimages/file/48059859496.pdfIn PDF document text
    • http://web5gstore.com/Files/files/mulajadifag.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/92701849719.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f327b5bfc---48808526143.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/dabixanedewi.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/vilafaxisaxodiwolexesadet.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5jbpg1l834d5rm2sppe6gbahj4/nazeduvarigewagunufebemuw.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/wobipijome.pdfIn PDF document text
    • https://solturism.ro/images/file/gitotodadipesivegunepum.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/11619053659.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161402cf1c2e96---57042452045.pdfIn PDF document text
    • https://mimpiindah88.com/contents/files/nixomitakexuletijofog.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/81770232528.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/91883108955.pdfIn PDF document text
    • http://feg.vn/uploads/files/76082350650.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/disufunadipaxivowijifir.pdfIn PDF document text
    • http://opsir.eu/files/file/21284021666.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/63888898292.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB55 10724 bytes
SHA-256: 2808fdaa5c0813e4612b89c515e6c95590eb751952ae723a519a48d7ea7092b8

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