Malicious PDF — malware analysis report

Static analysis result for SHA-256 d62e9f3eaad9051f…

MALICIOUS

PDF

77.1 KB Created: 2021-09-18 20:31:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5dc02bc192c371e2c1abef4e56196fc3 SHA-1: bcae7a67c5895e9a015991fb209d9317d9aeeed3 SHA-256: d62e9f3eaad9051f3731cd13b80858855849ec604b2a39d32527a718697aa0bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs that form a link farm, pointing to compromised WordPress uploads and disposable hosting. These elements suggest the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

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://inwebjor.ru/uplcv?utm_term=mulan+online+stream+2020 PDF link annotation
    • http://sterenstein.ru/userfiles/file/donabe.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/kizonutuvojixola.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/pewapab.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/4689663e01fd790ac5a0d684d0477a3d/lotakoveluzisexisedeto.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/pumifobokitiluvixobera.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/rekufonaxer.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/fipusabutivusite.pdfIn PDF document text
    • https://bi-kiesabbau.de/cmsimple/images/file/devuzizuvozisu.pdfIn PDF document text
    • http://lejonhund.com/upload/jaribolimuzokadexegodate.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/rejixirijovopinepudi.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/86015015917.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/59315622045.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/virirawitulizorilip.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109140304588867.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/3722e738575357e4f6cc19d2bd1fe249/90742125520.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/42167473907.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c5c83b9bdab47f6d0bb16e21a76b5409/6155815983.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/f21226e5a06833aee6628da8fb3b82a5/13842563616.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/72828048191.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/sufuderogafawuxumomaw.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/lokeliruvapanezobul.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/zadamodemirowopukusu.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/kusuxabufinakosuwarexix.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/29406878758.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/zamudawajafezare.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_off0000c642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC642 18616 bytes
SHA-256: c8ffc7264f374a416473acd4f08e0a7d1ef1a4b5751b033d152443164be340a7
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 10604 bytes
SHA-256: 74cad6fb8026a59d734a40c06cf9d06b2386ce51a02a382167fd65b5eac84215

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