Malicious PDF — malware analysis report

Static analysis result for SHA-256 c969cbffb6f16a4e…

MALICIOUS

PDF

87.8 KB Created: 2021-09-17 13:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51925d1cc2a21274fc9376a2e51792f1 SHA-1: d23e4774e97b7b46e97a14fd03490023ca4d12d0 SHA-256: c969cbffb6f16a4e55ee38750318550ad5ea64b5ef55f1f6bdca03866962b339
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly suggests malicious intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://allytemp.ru/uplcv?utm_term=record+call+android+10 PDF link annotation
    • http://caopump.com/admin/userfiles/file/nuzenado.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mekipabuxuxobepo.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/37915503980.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/zuxojibevimifulolesa.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415f8ca4d4c---55535831567.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/b6ce430ce370185c9d120ba5e8bc7937/nuforixid.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/64594262616.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/77156208044.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/duzimorug.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/57260856405.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/86244867492.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/36321666867.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161375565735fc---4626756918.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/37153633414.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/fakarikivininosesagamuf.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/povasojizatavaretivomiw.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161393f163de7f---40249596266.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109170302267139.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/bubosurodan.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/zezuxusowusolefa.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/aa49185082b9697b350287b1ab405b36/wovudunizikotexaxenekata.pdfIn PDF document text
    • http://modern-pro.ru/files/file/makakemobopixewafexa.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/20976052472.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/vonoxel.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_off0000f1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E8 18560 bytes
SHA-256: 1fc08d4c529a9e1a7dbbd19a21133b55d9dc072afbacdfa7f571a38a238fbc3b
font_01_sfnt_off0001222e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A45 10316 bytes
SHA-256: 7f9ba3919235b974b530df392a70e5a9614e4738aacc9e791bfa6410a9c35b7a

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