Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc681d1e606b11ed…

MALICIOUS

PDF

71.9 KB Created: 2021-05-26 03:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f58bdb80172c7fa7daec375f464248ef SHA-1: ea411e6c595938c1904b5f21114f7a855c56a56b SHA-256: cc681d1e606b11edabf81781a6f176a987195da758b93f1429e26efb39c2340c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609260b6930b8---34148068763.pdf
    • https://landbondcorten.com/attachment/file/d6f9ff8e6c12c9f041d936e16c537323.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c89b215eba---91897525229.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a97e4cea9b0---tinuk.pdf
    • http://nitexprofi.cz/userfiles/file/zonirupaxumeberofekawe.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/7d2c86a8ebe8955fae4f2908a4853b66/49977056942.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981c4ba130---juwovutugeti.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961e2428a28---nelemetubuvokikop.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/kfnt6jbo8skpoq7remqqcfjr6b/10516515932.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d55018a9bd3ce1b6f88d75d951afa24f/7379316089.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/f4e3da343045bb63627b8e8f48d029d4/51237609328.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f600e3516c---99549675448.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/imaau58bcnm3qag6j93vrilu75/71107579105.pdf
    • https://securityguardsupply.org/php/uploads/file/zatigejopozuri.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf6298ac4e---sonadut.pdf
    • http://bensonlandscape.com/editorData/file/guresufametugapoxupebum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=valspar+latex+zone+marking+paint+sds
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc36.bin
32801f6e98f5afce6a566c71bc54e0666cd1977838151f34106d7ea3d178019f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC36 5424 bytes
font_01_sfnt_off0000eea3.bin
dca5148a040aee694e55b5e0cd0fcd1e7a9beaf71d100e67a1b56c0046bfcca3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 11676 bytes

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