Malicious PDF — malware analysis report

Static analysis result for SHA-256 20355780546887fc…

MALICIOUS

PDF

74.5 KB Created: 2021-08-28 16:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bb68a2e4855f983deb7f15bf832c5260 SHA-1: 1eb641e0c118e82efb347d6bd35f8841eaef2e96 SHA-256: 20355780546887fc2f88d1c86f66908e3edb406f4eef45cd6b198fd916ef3938
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=group+by+with+where+clause PDF link annotation
    • http://ttccid.com/userfiles/file/muriwevoboxepupunu.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/movifawafemajuzope.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/2df0301825dcfa1c1379b474682f6931/63131471442.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/37310583752.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/rudekafigasega.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/tmcqahmqla447fa6dd4csrjn52/99528153190.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/58247721418.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/tajidepapi.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/bozoj.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/62123743872.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/xixokupugimesafixadakawaj.pdfIn PDF document text
    • http://keramann.ru/uploads/files/sojexax.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/duwopakuro.pdfIn PDF document text
    • https://shibbirs.com/media/files/digilogol.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb908b85df---25621088886.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607800a15aea0---kekanumaf.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/tisoretoxedanakipenop.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/linirevopog.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/50393438191.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b80d3db3f0a---16661156601.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/lixonunegizinovemupup.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01fc39c6dc---24181369615.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/tidiruzoligi.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c547da87108---limuxizulotire.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_off0000c2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEA 10848 bytes
SHA-256: 0574fc1129685aa062a1e00a0c886b329ebd8e8e86f0bff566938b2d15678208
font_02_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 15988 bytes
SHA-256: fa5a5c24cc483fb546d374597fe176f03afb9f6fc729f8ed90937f8b94b5c2bb