Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ab23e0094dc16a…

MALICIOUS

PDF

82.7 KB Created: 2021-08-29 15:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a75aaefe9d07aa7d08f4bd4432aea920 SHA-1: f1fdf872dfbc2cfc238b2c3ca31e5909b75f7cde SHA-256: 50ab23e0094dc16a6e7b87edc7e247d46f0c1372366d63d7443233f559045b68
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://nowator-zpu.pl/userfiles/file/rivasusijom.pdf In PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03c826bd8d---72604735227.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/164fb4c115718ac090a88e6a2538b8c9/21822579725.pdfIn PDF document text
    • https://nexusmediation.nl/files/66508683175.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/mawuminegota.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/32938970016.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/3e86d20cdd0c2a9c0155dc97ccf671f2/dibafebazokas.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/52105359584.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d226d9d36c3---zipusesobekiwe.pdfIn PDF document text
    • https://anakaygame.com/calisma2/files/uploads/82920827227.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/ramowusakaguximodiburodoj.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/xotuvadabinegogifavoxakan.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/161051b9a75d21---goseliridewemafemumaduzak.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc36d4073a---zoguwupexewadupasij.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608414c2caaba---fezekureboboduvejafaludu.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/smrr91jj37fpgrcb6pc913djo0/futaxofugumutorujixikofe.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/99469899190.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc814cd31d---77913511005.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/905fbae9d773d5f865e4e44f3fc2923d/jezimepabig.pdfIn PDF document text
    • http://krzeptowski.pl/file/dubawozujug.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/34630710960.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1611e8751b4aff---73673767539.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c690f93b6f0---64834580540.pdfIn PDF document text
    • http://vejwun.cz/images/55801540528.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/3ddf5ad8e9c2b20294641389db3bfd15/wazera.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078a1c52a2dd---denudipigadoximutewuzubeg.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/471731138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=areola+medical+definitionPDF link annotation
    • 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_off0000e14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14F 16920 bytes
SHA-256: 33ac6ba4cc5e837737b717f4e3226f5e056982bdd14749cdddf8afec951bce2d
font_01_sfnt_off00010c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B6 10448 bytes
SHA-256: b7e6eed5399145d9963490b8cee8ffae99181f14b6dedfe24d02417a873273cb

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