Malicious PDF — malware analysis report

Static analysis result for SHA-256 4523bde3b4b56825…

MALICIOUS

PDF

75.0 KB Created: 2021-06-13 06:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bbf1bfa1b467103b906186c38c247f52 SHA-1: dfd188b0152343adbf116358ce67f23f0f57b30e SHA-256: 4523bde3b4b568254546ff421c37f8115695f6af89ebb292e0859c859808cc14
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to distribute malware or conduct phishing. The embedded URLs and the ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution by luring users with popular game titles. No scripts were extracted, but the PDF structure and URLs point to a malicious download or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://infrive.ru/uplcv?utm_term=assassin+creed+valhalla+pc+torrent PDF link annotation
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/6kg7s8memoq9gmthmig2832n0c/nawusawi.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3bca4eeae---95794880747.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/68f6ih9kjotf0scv5qeit7ce91/42730633507.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9dc67b3c9---gagagoj.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a693d53debe---29755966308.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/33525759075.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/hlj0b5jt27g3ithkjtf3svo01g/denalerulofe.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c763287ed27b876512db165faf28c1ca/95286953972.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/26622133196.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66f09013e---22602558714.pdfIn PDF document text
    • http://plncse.hu/php_data/file/51195085760.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbf89b5422---saroxakewuf.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1609406aaa8a08---muvirubi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/0d458b535b25a2256e6f23a8bee5ab36/48022780300.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e3f39120ffb14289d31930684a2ccb48/62035662046.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 5208 bytes
SHA-256: 6ea5193311a580de50ac9fd38aba8fbaf55e2ddf650861d95bceb8ad24643d43
font_01_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 11948 bytes
SHA-256: e422bf8bed860365f4625954c072b64e22d3d1cbbe3b61dc5da4a458f990cb1f