Malicious PDF — malware analysis report

Static analysis result for SHA-256 5403b40f2052ba92…

MALICIOUS

PDF

81.8 KB Created: 2021-07-08 05:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2c45a6d822fabc23686efb3dfbbd0541 SHA-1: 4bbe0516c1a19aa056560fc7b329d7ce4f2f7f5d SHA-256: 5403b40f2052ba92b2d60612e3e19901c04082e0894852e979382df987850a05
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed multiple heuristics related to PDF link farms, including links pointing to compromised CMS upload storage and disposable hosting. The embedded URLs suggest an attempt to lure users to external sites, consistent with phishing or malware distribution tactics. No scripts were extracted, but the presence of numerous URLs and the 'link farm' heuristics strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4803

Heuristics 5

  • 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.
  • 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://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/ab80f7a9024111498d19f2c5b9fcb883/rizederodix.pdf In PDF document text
    • http://sun-eko.eu/files/file/51745305128.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/9796562726.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/vutubowitabudepinil.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/c03o54hpmc087613itqhh4khsp/6156311113.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f448d51cebada2b5800ca12d03ace536/nunoxujikoxizitafetomivu.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adf046eba47---85978699137.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0c4b082c3---20105493310.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2c6f0bdf9d---28974079075.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/61826684508.pdfIn PDF document text
    • http://bscartridge.com/pic/xomomilowana.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/0eb6a36985c9cd0742cc60e057a05acd/1060730064.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/towevixumokiwil.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210527_42E4C345AF0DD3F1.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/8878807618.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/49983540911.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/kunalesodekulefolitulivel.pdfIn PDF document text
    • http://prosquash.by/data/kutotovegenojafekivev.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/nesitefoxul.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/jisewemobewazuxokotapifal.pdfIn PDF document text
    • http://hnatiukreunion.com/clients/b/b5/b5561851e3069b632e798ef7a1275556/File/wixunonuregapam.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd6833d39f---94153540579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=watch+fast+and+furious+5+onlinePDF 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_off0000f0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 19184 bytes
SHA-256: fe2355cd3a40abe86f97b90d7337bfb1a85dfc841a5c3edd75ea685e8685dcc2