Malicious PDF — malware analysis report

Static analysis result for SHA-256 417f7074c0100768…

MALICIOUS

PDF

57.1 KB Created: 2021-09-02 22:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f23967422115c726d3814755e6127868 SHA-1: dc7aed74e017779d9a316341528ce14c91706e1b SHA-256: 417f7074c01007687783fdc3f9e1adf77ff45ce09e046d1fcab877dbfded6c71
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. Several heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites hosting other PDF files. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8505

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
  • 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://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609175ac8be7a---35546992769.pdf In PDF document text
    • http://nitexprofi.cz/userfiles/file/bosagodewuna.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/3902419784.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/gavirevamepifopugiz.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/vidotakasifugepofevukotiw.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/74a7ea02a9c87c6c98cf4241105686aa/duwoguxevuje.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/xelikal.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/kuvebezuremezajomigivoj.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/a8445292e6875ff7df350911f0d393c6/9702323245.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/38465391169.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/vuxobadajikotas.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/25045350431.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/zebogo.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62a686b4d---vunigegupakikaxuletera.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/48f2888d90708000b005ac6223817087/nagebarug.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/13859733983.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/99778763885.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608874048d6a4---35759247760.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/95966777688.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609055ea08da0---kiwafopigorodibuke.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/sumoxenirebegaf.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/b76c5151bcb391c139fed04690e32ca6/mibipabigu.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b35a96c864---62821233888.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16103886baffeb---37147643835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=importance+of+qualitative+research+in+education+pdfPDF link annotation
    • 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_off0000b6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BE 11148 bytes
SHA-256: 0549c9abe4daca7d935dac9de2b46fc61a4035c8d70a86dcb8655c80bc2307ee
font_01_sfnt_off0000d062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD062 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1