Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d2c90e2fe66b8a…

MALICIOUS

PDF

71.9 KB Created: 2021-05-07 03:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b73e0b86e7c7e0bed5511215a754ca4 SHA-1: 72dc03926d47b8816cb21b31718bef02e259ff7d SHA-256: c4d2c90e2fe66b8aacabca8da9ae1330d3100e6a81be3ad1eacde1b8311bec04
154 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, directing users to download potentially malicious PDF files hosted on compromised WordPress sites. The embedded URLs and the document's structure suggest an attempt to trick users into downloading malware under the guise of legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8179

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 https://medvor.ru/uplcv?utm_term=jorge+baradit+libros+pdf+gratis
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073c0afbcdc8---wujerif.pdf
    • https://annjulieskarpmo.com/userfiles/file/vurafogififi.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hvrp2t9r0feka4j580vtpmie23/sigeb.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607623bfb78d8---88784534592.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/28c1f8b1f0694c312f4414d9e607b315/zemawabegazolol.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608502b6be82b---dijire.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160785384092f8---17402190897.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba9030fab2---bewesefito.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fffc9749---debizexadisadozariba.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160879b682ce98---nudazikifujasogolaxorem.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b4546c2b---gapubamina.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/64a0d48d773633755b21b9dbe6ab08f9/22177572081.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607019781be92---virid.pdf
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/51853178b77f4e10939760fc0632db51/vozevebuxiki.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080191483d89---jumozixitabol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e8.bin
69a15e709a037164c4c60e99ad4e0946df481050adc7afb3bb15c11562d1dbf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E8 5336 bytes

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