Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19f3cd5fcfd2224…

MALICIOUS

PDF

82.9 KB Created: 2021-07-03 11:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 284c933de821e52ccb58a363a36b3dce SHA-1: f4f5ec80a37f3098ee6071260f1f45177f1794e2 SHA-256: f19f3cd5fcfd222406611f25f7359d922e2779f694fb46dc55aee96422cfac00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/s799o7ofllporv9v3evma1rjg2/64137818563.pdf
    • https://aduanaldelvalle.com/userfiles/file/kelutamat.pdf
    • https://ta-taiwan.com/app/webroot/userfiles/files/94052610234.pdf
    • https://iringmalaysia.com/ckfinder/userfiles/files/mowogitapumebedase.pdf
    • http://accessprecision.com/userfiles/file/xefenasilegufotigo.pdf
    • https://theatresaucinema.fr/uploads/file/gevof.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e8258d78f---92250776437.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/752ba09063bb7abd2be6c558be865f72/1349409878.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ac6c361e---75242259915.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/f2f33f088a8892a915e0eab526cebeb7/39375705364.pdf
    • http://dentalclinicbangalore.com/uploads/95460528852.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c737dad143---6381810130.pdf
    • http://burnettefamilyreunion2021.com/clients/867108/File/vavezodi.pdf
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b8552b2db6c0f1a26acb8ce73bb42d9d/wofojizamupigu.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/fbor335llp6qbbk5vo61ja21u2/gufexawozo.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a04f0b03621---15033401717.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/26307e7cef921e2b15ce434c6b608841/89224722222.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab80fb41c53---gujebukumixo.pdf
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/os012q9v39ogul4h9ejiqkseag/65070617528.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba881a28d50---gawanunepawenaworikoba.pdf
    • https://aawyx.com/sites/default/imageuser/file/gatitop.pdf
    • http://karpatskiles.ru/store/files/tajujimetozuv.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d0a8c556---dugunobinonatozos.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+add+notes+to+a+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d2.bin
05197c1aaa9297f54510276992d9ddf87f1ccdfbdcc5a1dc513cc8b896b1b6e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 17672 bytes
font_01_sfnt_off00010e3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3F 16792 bytes
font_02_sfnt_off00012656.bin
0c2988303d62d47400dfda889ac64d43350cab74f12d6d64ef71d49de1098230
pdf-font-stream PDF embedded font (sfnt) at offset 0x12656 10544 bytes