Malicious PDF — malware analysis report

Static analysis result for SHA-256 6444d4623a0d6263…

MALICIOUS

PDF

94.2 KB Created: 2021-09-05 03:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ccb15fba76acea6467f01050dd7ca97 SHA-1: ba1c251b503e55d89c1063e56548f1d7f3855bc2 SHA-256: 6444d4623a0d62633304c8efe7dc325f0a2e460e249016744c1a8a41ee18bfa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or download of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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://cructi.ru/uplcv?utm_term=2018+civic+brochure+pdf PDF link annotation
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/af6e10f2fc555c6e1ed9d40c87a5030b/54905959949.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wuzatoluxunetuzeb.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160add2fbb573b---75837471881.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/kopugejew.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/54057978826.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/23439066512.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b6819d09252---99986277359.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fd38f0ae2---jojibovanino.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/gavikira.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c1d68c5bd8e---josim.pdfIn PDF document text
    • https://soechi.id/userfiles/file/36197826650.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/lovobodonojinubepadezeris.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/27464814542.pdfIn PDF document text
    • http://pressvaluation.net/userfiles/file/65548272432.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/jogogidadigidopebuf.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abeb1e250ad---99000320827.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdec916fa4---jigimufipobonilosol.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070fde952b55---vibakekowuwojufi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076da035274e---tilesutu.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/gaxokofujexopobifi.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/tisowolafadikobirulutif.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/74n6434cosuljdla3re853gap6/fenilexuzobovojowigigeku.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/5969817654.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/50541055966.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ovnivrq44ju2p2omm305mf3une/36254557073.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/zalefekivoxetevawa.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D0 18864 bytes
SHA-256: 25d2f2712e1f53de1be0e11c56475d89dbf07c0302875cbf951fdac840f8a869
font_02_sfnt_off00013660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13660 10852 bytes
SHA-256: 7d24d41f00710083811bca850cb16fc81f32e46ec52df107fdcb6552e011d698
font_03_sfnt_off00014f61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F61 17888 bytes
SHA-256: bf1e542794a37fa8f22cc6d338fa3135971f71ade3d73eb5b59c6a12841a02c5

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