Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c59a433c002f7d…

MALICIOUS

PDF

71.8 KB Created: 2021-08-30 10:12:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9d755b8302861dbb9bc8f89c84444c1c SHA-1: 8328eb93261753a354e6113fe5f6d498e84ac2c0 SHA-256: 93c59a433c002f7d1a9518a1cfbb16dca6741b6d4118b515da8032f2b6f1b9d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, designed to trick users into downloading files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the link farm and compromised CMS uploads are clear indicators of a malicious distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5557

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://crewmak.ru/uplcv?utm_term=ncz+viewer+download PDF link annotation
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3049df22f2b072a89b1efc7ee67802a0/mutesojo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/lavajejugurix.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/66934867727.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6a78c386917f6e2e3b1404c69bf40bcf/ribituxapaja.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be10dc11ebb---42265957623.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/7d5ba4ac9cb4fdc2b7310d09d445df12/zimuzepatawofekuvo.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/mumituwubo.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/62128721786.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/51995745441.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sonovepomimabajugapoxo.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/bcb0565494af015109013eed28dccc57/vorojakexudafaz.pdfIn PDF document text
    • http://4yoga.by/pics/files/43589294249.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/vulibuzanajamudero.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/38426578408.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/onuq2rg4rqerlq85hb12gj8u22/pepum.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/22970aba616d1c061d0c922b21d80034/wujutijidafukufakevug.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/latevubajitutemasa.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nanewanufupej.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/diwapesibajitatunujasiz.pdfIn PDF document text
    • http://minerva-collection.net/files/files/47349184292.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/kh2mqo1edeo03u5pe7gkq085oh/sunuguwezokipofowemawij.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/fofinozuzoke.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/70e280b24e868b77266266d9607a3702/28762264794.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e19182594ed---96427687650.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_off0000c96b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96B 18188 bytes
SHA-256: e2cd4b73f5b2ae73ec895146adccd5904d8aa10d4628e61c53c075f85305e9ff
font_01_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1