Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ba3a7a1e52f8bea…

MALICIOUS

PDF

53.9 KB Created: 2021-09-21 15:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 36f4962fbd1b2f6f5d4b62d279ab7061 SHA-1: f970edb304b77f9bb947ec418d22e0ad6328a828 SHA-256: 6ba3a7a1e52f8beab8c523ca17263aa77143b8232b31715060602196df80e937
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The ML classifier also flagged the PDF as malicious. The primary function appears to be directing users to external resources, potentially for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8512

Heuristics 4

  • 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
  • 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://inwebjor.ru/uplcv?utm_term=mxq+4k+rk3229+firmware+android+7.1+2 PDF link annotation
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/97826236656.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/61867457659.pdfIn PDF document text
    • http://hoachattn.com/image/files/nexododudusaniv.pdfIn PDF document text
    • http://htygroup.com/upload/files/lavifunasowevele.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136daa50d38d---77941479865.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/8608677324.pdfIn PDF document text
    • http://rjt1.org/upload/files/66583114477.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/gigegunu.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/74240296536.pdfIn PDF document text
    • http://gatewayhotelbangkok.com/upfile_hotel/files/37122425437.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332505038f9---kesuxadenagakaja.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/livase.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16143d949a607c---mosanowubanirowokazixab.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/32847838366.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/dejifabarosa.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/22d6b664c6920f5fe28afd08d7cceb6a/zufofezuvi.pdfIn PDF document text
    • https://fabriziochessa.it/userfiles/file/62180890106.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/96703535532.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/38816390504.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/96732329294.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/sudilokerosejegudefi.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/zadusalepaniwef.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/88903556801.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed6500e035---rifetodiwasubetoposin.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/55454031548.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD83 11328 bytes
SHA-256: 15071ca0dd77c1c70ee15ab2defa549c9a1369d5d79372ec72a091d4d4c3b2b5

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