Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5ceda9a08128d6…

MALICIOUS

PDF

79.1 KB Created: 2021-09-17 22:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6f9251fa0238e42870a0ae2293446d36 SHA-1: 86e1034258f458314faa262867b76b8eeec9c9df SHA-256: ca5ceda9a08128d6a2cda377d5464afd59e98856e8f1e734afe0a2cf3de6fa95
172 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to compromised websites, suggesting it's used to distribute further malware or phishing content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=pubg+korea+apk+free+download PDF link annotation
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/94719078412.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/4704996348.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090411000038.pdfIn PDF document text
    • https://carolinevlieghe.fr/images/file/35382659455.pdfIn PDF document text
    • http://usateatop.com/_upload/files/78705657896.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/zesovasotirazazimulidakop.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/zaloxokefawuxexisura.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/92588516013.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/ruporawuru.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/xosasotusoze.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/gomelefijurunetedevu.pdfIn PDF document text
    • http://otczenacts.com/media/files/24443147746.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/51932142107.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/14d7j29uf2a8qt0ijrihatqpvo/49651677195.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/65322091194.pdfIn PDF document text
    • http://fruhmann-elektrotechnik.at/jububisavulipolobof.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/ce1069632c3d1bda96d3d7af0ab66bd7/rimag.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/juzuvijunidebogenosi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142cdc05416a---wikederozuwedew.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613205af00b95---munumozupo.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/40641816003.pdfIn PDF document text
    • http://rooptex.com/uploads/silopiju.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/ridosagilenososekazaro.pdfIn PDF document text
    • http://fitviewer.de/files/file/xujijoketuvozatizozus.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140433dad8e3---44671615206.pdfIn PDF document text
    • http://primaneighbors.com/userimages/64502975534.pdfIn PDF document text
    • 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_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 17952 bytes
SHA-256: 029c121aab86b6302466e5f0da26d4330bad87f594f5f59368ef60ccc0996241
font_01_sfnt_off0000fe31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE31 10732 bytes
SHA-256: 05d544dcc8af06e9c7870b4f39ed35dac17b8469963eec1eee7a2e2a7982c1ae
font_02_sfnt_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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