Malicious PDF — malware analysis report

Static analysis result for SHA-256 c23ec9b8a9e7e16d…

MALICIOUS

PDF

65.1 KB Created: 2021-09-11 04:45:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b82c03dc44115051122295e0176837f4 SHA-1: b0da746109eac3b757fb4d0a628df191fe2cd149 SHA-256: c23ec9b8a9e7e16d57a6d94a6fd354b2d2d7ee2926940990ccb8370ff0a3aadd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate this is a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9524

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://towa-aaa.jp/userfiles/file/98709541583.pdf In PDF document text
    • http://locum-system.pl/userfiles/file/86930298581.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/if2egnbs3nipu1cq6773ljrqr4/91278891794.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/rukizu.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae6cec6c05---suzawinonuf.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/monifus.pdfIn PDF document text
    • https://oriontradecom.com/ckfinder/userfiles/files/lumuvijuzatigaxijifa.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/27944713666.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/50109846633.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/luzogajefalanerojejojug.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/ca8aa2d287d0e018b08767942b895d42/sutovofo.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/fizefuvi.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/62375829173.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/96106023649.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/fivijegokokoxafazef.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/83054274772.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/58905951053.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/19969606239.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/57cde4f267d676f8f151adea5ccc1f95/tuzumozenomefevatapovu.pdfIn PDF document text
    • https://dom-titan.rs/files/misugab.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/golufes.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/85761817155.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+is+bad+netiquettePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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