Malicious PDF — malware analysis report

Static analysis result for SHA-256 525107f9cf43c31c…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 10:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a6b636ec8dcbc1bb4a735a55da5e2f9d SHA-1: 8a9568811ea4ef3ca89b5931f13d90485d4cc6be SHA-256: 525107f9cf43c31cd951281d306de8fb17d34f6f89fe06b29eb3934f51801ed6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also features a link farm pointing to multiple compromised websites and disposable hosting, suggesting an attempt to obscure the ultimate destination. The embedded JavaScript likely facilitates the redirection to these external sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://catamma.ru/uplcv?utm_term=tragedy+and+the+common+man+pdf PDF link annotation
    • http://usmleworkout.com/files/file/29357877185.pdfIn PDF document text
    • https://kovosluzba-praha.cz/res/file/25609174898.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3b54dc956---72897037199.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/kotajiwuzimokexumo.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6dbf9d762a56d20d567e7e986beaeaa2/lipelobofolimavurig.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da6bbc401c---lijojoruzotane.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/62648646241.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/29aeca7bb39aed1748a0e9b1da8823c7/98148335428.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/buremagibibe.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/9678547063.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oqt990ct1i3ekqd239hsosu19t/difidatotiduronegonefa.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/675fb6cf0ff9e648c36768c61e764cd5/3657412774.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/95048253e9a35655b0d1fa0c015097e3/lapopuzolon.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/96217889086.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/zovobejixexowoxokijuvefi.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609849a304b57---31411040543.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1d659d85c5539e796964b224da9364fb/pidenosebu.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/92121960042.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/tabatejijasolafis.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/3l49at1ip8jn5spqr4mkshn5l7/61374314657.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/92256238843.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/87137212953.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/t909qkpog0jlofeblqh7r8vav3/97541340020.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9345beb8---varigobekewutoju.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4cced5b69---15763491828.pdfIn PDF document text
    • https://angkalaris.com/contents//files/zaxapeluzisized.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_off0000f8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F7 16256 bytes
SHA-256: 6bd0ba841af1a1471511f1d7ce06b58cef7072af9406142bf1887307aa0dad1b
font_02_sfnt_off00013b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B01 10836 bytes
SHA-256: da37b89f0ba12e3ffcdf473d4eb61e42b18397996de421aa5c52e33479512e25

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