Malicious PDF — malware analysis report

Static analysis result for SHA-256 2743405570b628dd…

MALICIOUS

PDF

69.2 KB Created: 2021-05-26 03:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b17bcd9d69be604072012d57dc616ca3 SHA-1: be02ad77d7cd82004599315cd9c564b7ec208b57 SHA-256: 2743405570b628dddff8c90c93a3c884cb8674a1ec92ae72983e7efbaedf6afb
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8988

Heuristics 5

  • 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
  • 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://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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