Malicious PDF — malware analysis report

Static analysis result for SHA-256 469259d2f8d2f574…

MALICIOUS

PDF

81.7 KB Created: 2021-06-25 15:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 91f605bd79065645e3b39b4e90d440ed SHA-1: 472173d56531df01d0d02788eb2ff291e5ff4994 SHA-256: 469259d2f8d2f57416c803f104657ab7c25aa98dd523d609161ad89512f470ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations or disposable domains. The primary purpose appears to be directing users to potentially malicious content hosted on these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=compare+the+physical+properties+of+acids+and+bases
    • https://abyway.lv/images/ck_images/files/76704070919.pdf
    • http://beveragesgs.com/userfiles/file/nilonubisutobetaparejok.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/43d72fb2dd0ccbef05458282e8192832/xivuda.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16073c91b9e944---kewadazesizirifuvitor.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/cdb8e6f38e4aefb7b4ec314f2d69034d/fuzix.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/wozadabapujezalega.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a7053f3dee1---pulovizejidik.pdf
    • http://congtydaihai.com/upload/files/pifufawetowoseteniju.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0d4no277fvr7gmccke3sg0b4g7/93881228292.pdf
    • https://5a.ro/ckfinder/userfiles/files/kapujizemivakawegifepo.pdf
    • http://fixafilm.se/userfiles/file/vesazesovofat.pdf
    • http://internationalnetworksolutions.net/files/59704312459.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b037bbc1a88---68482012583.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160876118e5803---nazebosite.pdf
    • https://hanahana.vn/media/ftp/file/47744013128.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_off0000de2b.bin
dce7b3b8df4297b373babfe1b3fe9c85a9578268f4d0dea950b01e5bd1bbe8f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2B 11172 bytes
font_01_sfnt_off0000f7e5.bin
e076c23a65ceba4faea2bd3b0848e9fd619525f7d1b24f4ac9604f6f55367278		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 16172 bytes
font_02_sfnt_off000121cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 16792 bytes

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