Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebaa62027aee3a9…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 18:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 036d924ae8ecf0454a88f4c4bab9380d SHA-1: 03d3be73a425c3552cfbb3a5466f1ad42a6b1a54 SHA-256: cebaa62027aee3a91ea9fc618a630aacb8d73bb7f7bdb0da0d0f159f2d4ee8a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to potentially compromised WordPress sites or disposable hosting. This structure is indicative of a link farm designed to redirect users to malicious content or phishing pages. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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 http://yangs-ns.com/ckfinder/userfiles/files/20210618032515.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612bee9d33e24---lojekavakekaxowebafebe.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/40774562270.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1185cef72---zusogutufi.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/rojewexir.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757df0534e1---62063861288.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/gonom.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081216723073---42182518952.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/boxiv.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/ea0d0da8b251b1df9033ee71988454bc/94140540759.pdfIn PDF document text
    • http://kasystemofkarate.com/clients/861259/File/javogukov.pdfIn PDF document text
    • https://airtelco.com/data/users/_/email/files/57617976739.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/d2f067f9f051ab02ed045eab249ec089/letugefuvolakudu.pdfIn PDF document text
    • https://medius.sk/userfiles/file/tigigikunusazokagu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1609dee9f74688---70110839775.pdfIn PDF document text
    • http://abwrva.com/uploads/files/17650986693.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161128352104ce---82666420326.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/lixurufixekagojifozo.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/rakelakig.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/nuzelare.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/josenimepefalepi.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/wuwafogafadejijumigufo.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d76317baa2---lirinilatude.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/38217875048.pdfIn PDF document text
    • http://rnralpha.cz/res/file/5052407634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=cultivo+de+dunaliella+salina+pdfPDF link annotation
    • 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_off0000bd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD45 17756 bytes
SHA-256: c219c5e86e4fd8e45a92db56ed9528065ae7aef448cc038cb9465566218da35c
font_01_sfnt_off0000d832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 10588 bytes
SHA-256: 6412276309091f4971e442a7a64973dbd74001c06e5ccd47a99b19cc5b7ca3bc
font_03_sfnt_off000108a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A8 16304 bytes
SHA-256: ddc82ffe544d56ed9be06fb202b8afd35c3a990124d1fa6dd7910f7ffdff8d4c

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