Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ca456ead759848…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 14:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5e44309d5412c346bc9860b9d699ef17 SHA-1: 743ef5d7100689979c4a0221798dd1adac8b84e6 SHA-256: 00ca456ead759848386f6aa31823af3a6026b0ef81c379a563b02942f083eea3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=inazuma+eleven+strikers+android PDF link annotation
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/8849e90af71d920176852939b3cced49/47557772506.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/latunisowokewubed.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/jejokasex.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161410ab7a7c59---dofenifesiga.pdfIn PDF document text
    • https://mlspoland.co/files/file/zagarajuxonakuvikav.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ab4450aa---gerugexiradusufe.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/gezuxitudazexifojofes.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/68932916880.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/soduxifisamavi.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/7658556066.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/jinapuxevusika.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/vataziduronegewut.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131579888e2f---57898832774.pdfIn PDF document text
    • http://agavietnam.com/img/files/tozisijusazofufu.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/62781175724.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/68220701763.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/gidazobaxikog.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/76668925887.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/masatekero.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/devafifajarozofij.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/deparesotowapixiperopav.pdfIn PDF document text
    • http://alkanboya.com/files/file///nojerufoxurikoxudoni.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_off0000cf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF89 18004 bytes
SHA-256: 6728ffbcd671725b8748c38061c69b30e0e8aa604da8972cb529d6ec35fb7d3f
font_01_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 10680 bytes
SHA-256: 95a017247ecf4ab0d41dd96df676a1deaed976bcfe0eccbfd97af6247e467d57

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