Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c17282f463e56f…

MALICIOUS

PDF

68.7 KB Created: 2021-06-06 08:02:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f174b5fa5a9442ea966991d02e7eab73 SHA-1: 0b4b5cf4e5d89339578d81df9eaf019499224729 SHA-256: e4c17282f463e56f61065e49c25f320e644c8f37c02b685a2b8013571298a8e3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://pixomot.ru/uplcv?utm_term=how+to+give+yourself+op+in+a+minehut+server
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609891a50c793---pobamimiwusinojinos.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735aad0bceb---34330826313.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16083959e0afca---78481189966.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ddc440c49---nitavirowopitogidunuzat.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16096bf6e54e3a---5971739571.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0610b8b76---5919556935.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/4190d372a2859806268f6983983c8a63/75799584597.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6e624f0e---15983844200.pdf
    • http://hasici-pristroje-eshop.cz/files/file/16462363962.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160766b7e36772---84285816447.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b95db7df02---kefavedovap.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/ec3443704293e5cc3b2458afbbe48c16/zakojevot.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf3f992d2---topubagawudu.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0a623f5a---65604312323.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16084af2073191---womevujiside.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d023.bin
391accc9a0955b3d9289c34fd749fde53ed16e2b3745098c60b76c6db785573f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 5532 bytes
font_01_sfnt_off0000e2ef.bin
569cf31979e5dc48be2e3f9bd6dea0cf048ceb243d64e0dd0e40f4bf456f3bd6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 10296 bytes

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