Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b2c10bc00de08d…

MALICIOUS

PDF

70.4 KB Created: 2021-06-09 05:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c257672fc673506973b48dfaa5ab4851 SHA-1: c9ca9a2ba9ef654fcc3732f9a3ca602b1dcb01a3 SHA-256: 65b2c10bc00de08d93be27b17db34302f407bc3aa5b1c9bccb905db738209be4
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://huntic.ru/uplcv?utm_term=r+relative+frequency+table
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca5034c991---95058255906.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e62bc64f---62639790732.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/l6nbhqjroa36q5d1o21fkhf0fc/83011302598.pdf
    • http://k-souz.com/userfiles/file/20213758118.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082cdec9fea4---nutidiwim.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f1a7632e6543e2d3dab6e90d1b8f462c/68854392120.pdf
    • http://anhuicrew.com/upload_fck/file/2021-4-30/20210430235604232708.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097c84d46c30---sisosokajozusipab.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f9b373f67---62410115544.pdf
    • https://mecaniquekd.ca/upload/file/69359821041.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2af65eb2---58524532399.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609323c23154e---34133464581.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609457f811fc0---zabuburewixupaxu.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/170b1b8d20987e4b715c2f4cef08a641/poriwokivinikosogi.pdf
    • https://bisnismedsos.com/userfiles/file/26656728769.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f5e3a38c6---tegisowanifoniz.pdf
    • http://playeasypiano.com/resources/fck_images/76114113518.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_off0000d5e9.bin
2ec21074b48b7851d0e6951b2bf8564bfd02f07e0ca6455bbbcfd6af498f2d0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 5132 bytes
font_01_sfnt_off0000e78e.bin
6947c7aafcd0c61142feec9e4b2f4409102e43e7b0ba7162d155ac6d28331ffd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 10936 bytes

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