Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4e9fc640f88ac0…

MALICIOUS

PDF

66.5 KB Created: 2021-07-07 19:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c8e652e442cfa5d09ca049f3d5b27b31 SHA-1: 6644cefe583d559d2ab1468e379772d2ad0c4929 SHA-256: 5c4e9fc640f88ac08c7ee752c0284e998a12b2775be5f74bbe027e1a7acab027
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the structure suggests it's designed to lure users to malicious content, likely through a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8447

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 http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/tjeqifgr71ufequbfa64kkj5t4/pasidifunitodilumekumegud.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc656bc56---68240695912.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160df20225b95d---welovitejisur.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/97930653966.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/87b5fe0713a66f591847fd4a05da7253/69179089132.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609733484fd2b---64949130377.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/59648327097.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160874cd67560f---fozozegevomapefewogogige.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/69649736866.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/c0f82697777ee74272c948d18fe7d692/13672321296.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160a6084d2c558---46029019293.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16097d78d5fdb8---36243782450.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cfc9a4b81---witefuvazuliboxipulogax.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/f30e564e84c4cc6fa9534b9f9b24e22f/xupup.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210613_024206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=128+usd+to+audPDF 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_off0000c680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC680 17416 bytes
SHA-256: 42c2c68af7bdbae88f0d244eda7522f5bc37c940e487833ec8daf97ee1991e0f
font_01_sfnt_off0000f488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF488 10148 bytes
SHA-256: 1e102d24bd3816b5eb6ca2955f74f22b787c534912b56c90b6503e71c73d984b

Open this report in the interactive analyzer, or submit your own file for analysis.