Malicious PDF — malware analysis report

Static analysis result for SHA-256 c686eaef9b3f65fe…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 15:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a72bfa80f258b7f579cfdc6e1be2d812 SHA-1: ea9b4e6d9e1822206fe9a6cc539c586bdaa9a8a7 SHA-256: c686eaef9b3f65fe9d450e96377c1752ebdc0c1d8b88942c605d3af4e6b01da2
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm, potentially for SEO manipulation or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://irlanc.ru/uplcv?utm_term=character+traits+worksheets+grade+2 PDF link annotation
    • http://alhouti.com/userfiles/file/71936236935.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/43263051461.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/nekorofobe.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab8d404e93d---59037477755.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/45501028445.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/1175172c39971158f2accd1e6c73a76d/23627605120.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/e0949bd9a96a22a65e23be4ffebb0270/23162111364.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16084e0323715c---68277813088.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/8803200707.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/55699665064.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210805000908_nn3hsn.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9fab82ef1---7650979877.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/pimirenom.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/39755498750.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/0e65aa63d776e7f85d3d0de8aef1160b/xexozowavekut.pdfIn PDF document text
    • https://renault-service.com/userfiles/22163874504.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c04de9fe---pewiniboxu.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/80187106191.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/tivutexav.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/visabuwusuxorirerenoxe.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/jodusure.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210625_54A1D44BC67A7E18.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/20203912195.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_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 10828 bytes
SHA-256: c8e1b406cd6adad1637556e4fc2fdb0b4fba6bf908f1ab9eb7492215dfa10cde
font_01_sfnt_off0000f1e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E3 17368 bytes
SHA-256: 939b15f8a45f0b12b9ed5d3272590b0ec7c8e0b15f9baeba4fa6f70dc938d535
font_02_sfnt_off00011ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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