Malicious PDF — malware analysis report

Static analysis result for SHA-256 9689049dfaeff528…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 14:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 400eb8d577c3ea25ed36fee1916c457d SHA-1: 7a67e0303aa45fc8fa8fe44e341cc5c1a66a037f SHA-256: 9689049dfaeff52833ccc82e24fc2683aa0469e05b58690bd3b1640d6d927abb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that form a link farm, directing users to various websites. Several of these URLs point to compromised WordPress installations, suggesting an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=puzzle+pets+apk+download PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb079e3bc---kexewotalus.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/tabipapaxewozudobototubo.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/5040469213.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7fcad2924bbf861213d7c01eb6ce8659/3871427782.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/xajipozasudizumolutimo.pdfIn PDF document text
    • http://sjanzee.nl/file/dapogigebegu.pdfIn PDF document text
    • http://www.giuseppe.ru/ckfinder/userfiles/files/tivuzelis.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/17846255697.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/55373993312.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/73314483418.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161443dbe5fdf6---23038377244.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631611289.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/3231672211.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/9429353dbe2500749f453e53dcff886a/dikiladigo.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/23215858197.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/jegazowomovupe.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/xirifaxozowula.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/52722181840.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/97168817863.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161475e72375f4---karoxulawajipetexexikow.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109151822537466.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/medego.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/16766102869.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_off0000b1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DC 10532 bytes
SHA-256: b55f20299eb0606086af44c9e335a431901108c18579cc0a82eaab9010c3c415
font_01_sfnt_off0000ca28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA28 16456 bytes
SHA-256: a2b6f62839c1dd2609f0d6bd86068299d7c81e7b6d4a2b42ae4a6d9f57f3aa22
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1