Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84cdb09f0ae2bde…

MALICIOUS

PDF

105.4 KB Created: 2021-09-05 23:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff477ee55b2747c6f9d9f8a914c03f04 SHA-1: 33f36250e4275e6bf2c236db89591e7bdf13a048 SHA-256: b84cdb09f0ae2bde366ab38373e716763dd7aad0e8a6a1079017c3973d9b8b1e
162 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6568

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://ikima.fr/uploads/file/texijatomesi.pdf In PDF document text
    • http://jinshi66.com/uploadfiles/files/nipasidowes.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1626524288.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/gugerif.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/11103653319.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6a768f4d0---70400233005.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/b94e0710e060d1e6457ce79bbeb00edd/vesadurudirajebesilaw.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/tupexususabokoragenapaj.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f87fba251db---19203056243.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210703101419.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081646885860---donurelexikelad.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/01tenvilqm8vkva1j61p0ibtu0/5084968939.pdfIn PDF document text
    • http://altus.pl/userfiles/file/49460099208.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25fe8b9f2---zikijemesofel.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///2021728195260569.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9090635773.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/41173535856.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/10925163059.pdfIn PDF document text
    • https://ancoraeducacion.com/images/lipubudetawixinixufi.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/46629475096.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/dokajeloxaxuzenow.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210611102208_cgtdy5.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/19849770622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=traumatisme+du+rachis+dorsal+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_off000159f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159F8 10844 bytes
SHA-256: 07aec61f8a02bcfb9df5fff5c899b6b406f5f1e04c04309c81cbbd7945ae98f2
font_01_sfnt_off000172fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172FE 23712 bytes
SHA-256: 3899032bfe2f1b0dd161eb720fbde9cc562e3d201d04c60a479cb5274b38a08a