Malicious PDF — malware analysis report

Static analysis result for SHA-256 be42b8cdff824c04…

MALICIOUS

PDF

288.0 KB Created: 2021-06-24 07:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c4ad844cbee54b4ad50893e0b7d84845 SHA-1: f4e5325cf1336d956e181ff5ee37acd7c04c0715 SHA-256: be42b8cdff824c04dffc0f81e6ab923eef60dba2e15994c0bdbc842167018165
132 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with critical heuristic firings indicating it's a phishing trojan. It contains embedded JavaScript and links to multiple compromised WordPress sites, suggesting an attempt to host and distribute malicious content. The primary goal appears to be directing users to these compromised sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9847

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2767dcd9560f70dd04a4c97451d70be7/92097220976.pdf In PDF document text
    • https://o2opr.co/userfiles/files/xewodujatuzudef.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210620223109110.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/98148015104.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/e86e2e9e563ca85dbc2b71decf415009/32063452361.pdfIn PDF document text
    • https://irrisyst.eu/files/file/54405973259.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160c39cb2e2464---7685230774.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd829cf60f---48964481921.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aff233462---zisewasazajema.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1ffce5d7---3578816065.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/lomegogewebevasaxiziweju.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/velizasanibosev.pdfIn PDF document text
    • http://digemnd.com/UserFiles/file/nafomem.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/69079395908.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/e7089bca0ac0c315b377a87a0b76cbdb/jilapadit.pdfIn PDF document text
    • http://hopkinshigh1988.com/clients/75739/File/3839472228.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776cdee701e---soxezediripisepilizu.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16088e16751aef---gifavukimilenerepa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=sp+1+manualPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00045f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x45F20 4372 bytes
SHA-256: 1a61743495830ac4e31c30d41e352663f34a7b68aadf4e3bdd24f32d6d22f24f

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