Malicious PDF — malware analysis report

Static analysis result for SHA-256 05aa5558a7a35f5a…

MALICIOUS

PDF

85.9 KB Created: 2021-06-30 03:41:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43869a41dac7f737e66fb0a98c930bec SHA-1: 705da68391371c35ffe0899953ba8a90ba0d4935 SHA-256: 05aa5558a7a35f5a878c11d39828f6ff2fdf4397f81df5b091a9cebbf70a9f0f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the presence of external URIs suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document designed for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://coretry.ru/uplcv?utm_term=java+collections+linked+list PDF link annotation
    • http://meyergarden.com/ckfinder/userfiles/files/21281202416.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5dc1d4faec75b1b6d96fa968fb3f7705/wifovu.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745138034c2---3598598147.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/252c065b5c27bf203f318b0280762861/gilusagozusosupoloxopi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7c4da7b8d---92206055186.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607632f5c341f---1152859502.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/pefufuwilexajarivewel.pdfIn PDF document text
    • http://ahchala.com/img/file/vamexuzavelojadela.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050321363372.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5fceadb62---pabojokupilu.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0efb7662---semisifo.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/nemurujilum.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b48ee6455---87044358527.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/vojijipixeza.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca19fa6ea5---sasuzezumoxotinaxamo.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/rizijum.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u69mbdcs66o519u43m0mo82v22/lareno.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d5034882c---gavukuj.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/66651216576.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160851b3c1761f---zavojukonenopisekugupoxu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9da927ed1---gaduvije.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/ritiwuwefudik.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/36187068475.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/420e21a78bbaeb345c124b1b481d2bd7/katomigego.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_off0000edb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB4 10412 bytes
SHA-256: ab346b69dbdf9190f234546ad209be13ce97d3da2aca81400d1ce6ddfaa87661
font_01_sfnt_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D86 17136 bytes
SHA-256: 3f104475c1b49c6b0cce6e9eb2031ca9d29f2288a16933e12a5f3018dcb3eee2

Open this report in the interactive analyzer, or submit your own file for analysis.