Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc19771559509721…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 12:36:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6e9c1656cab9cad64c0d7b1cf6dd07d SHA-1: 553b6e64ba1fad8d6b994eef6abf70674d28755e SHA-256: dc197715595097211f53dc82521bde85a1035cda900ef04d06d59e857142ad08
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=fahrenheit+indigo+prophecy+apk PDF link annotation
    • https://skvely-kup.cz/files/file/31289882062.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/fe98e7b40d5579a7257bfbec92ac6e4a/88521992316.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613672c574dcb---93869806771.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/josuzevafin.pdfIn PDF document text
    • http://sunpix.ru/img/lib/file/gugoge.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/19937300985.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/82152619295.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210916_CBB6E08F5EA0DCA6.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/26860452870.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139f1bd59286---milejet.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/65489823679.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/178cbba09294c33c7f90c6d40027eaf0/43505393212.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/reratowezizoropine.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/gijejogenumukifig.pdfIn PDF document text
    • http://0985028898.kad.tw/kads/ckfinder/userfiles/files/bipezivorujinawofasosod.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/51555730310.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/rofobuvodosuluvinatime.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/vevitenoso.pdfIn PDF document text
    • http://phongthuyphatloc.com/luutru/files/ditanazupowime.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c3666d022---powutupikajefonu.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/951a97e7663efb108e347326e02cb6e5/43656147746.pdfIn PDF document text
    • https://moiatakashta.com/userfiles/file/gubalofe.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/zokefenefizomekudi.pdfIn PDF document text
    • http://pololanna.com/user_img/files/kedaresupag.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 17124 bytes
SHA-256: 7d42f0e5e01961f71dc1f8de9adb8ef46acf4bc3b26dc6136455570b35bcc356
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 10760 bytes
SHA-256: a76226b18aff33da771991fecbd472f2a0e3c70345dd68e9f39c22b85c9c8eba
font_02_sfnt_off00011a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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