Malicious PDF — malware analysis report

Static analysis result for SHA-256 d766a1e24ec5a534…

MALICIOUS

PDF

83.6 KB Created: 2021-09-18 05:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37fcc918f711fd0f33a5978c54eff3f3 SHA-1: 7bbd2035e3ad7bfc061bf0a8bbf9bca54190c3a0 SHA-256: d766a1e24ec5a5347cee3624b69c4437136091de476175e5826affa2c0b5675c
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised websites and disposable domains, likely serving as a distribution point for phishing or malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://artistaone.co/userfiles/files/2261241072.pdf In PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/pufis.pdfIn PDF document text
    • https://ms2oke.com/contents/files/11943052584.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e98a7996a---20221243609.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/mukegakuxavubomavetok.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/9bd2plofpjqrk1phqdbsq4o7u5/vifafevutezubiwudag.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/85242680387.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/tabenuk.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613130c0b7d53---jogefubajujuveg.pdfIn PDF document text
    • http://bollnas.boj.se/uploads/userfiles/files/21969838408.pdfIn PDF document text
    • http://chayka-svg.ru/files/11141999951.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/444e9d0a6c3a3160b2dc1ad34ae2fff0/87185348335.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/zerizajaniko.pdfIn PDF document text
    • http://harnettcountyhba.com/userfiles/file/giwoduvozamoxigawaxo.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/jekujozomaliwiva.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc2c27045---tumulorolumoziwiso.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/360d4147bbbcedd872508a6fe13616bb/21831311669.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/sigakebudowunikeluva.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/56290560712.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/bimudajatadavafum.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/tubarofekubadoxebawu.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/4015436492.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/garukozuwofu.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/36918032403.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/bejulurire.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/62699185659.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/69279885217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mom+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE216 10136 bytes
SHA-256: b75eec99cac89960a8d915e936009c37aaef32fcc59f5797e7063a0b2d59b9c5
font_01_sfnt_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C6 18336 bytes
SHA-256: b430363d03870400d30e315460285fc1fff84a7b92c8138c86a0b376f7097572

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