Malicious PDF — malware analysis report

Static analysis result for SHA-256 7875b73494dd9394…

MALICIOUS

PDF

83.8 KB Created: 2021-08-16 00:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9a31c56a7c59c8a3f4c878f2d9d890b4 SHA-1: 89871089b2abf57c908634257ec647cdb3316963 SHA-256: 7875b73494dd9394ff73f48e385b05181ca680ce413311a442e0804c51577757
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://philabc.ru/uplcv?utm_term=eylure+dye+kit+instructions PDF link annotation
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c9gfm171abaig2pk78tntnuee5/71337328771.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/baa362028255bc6891cd92a679b8e521/taxelagakapoguwas.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/32550209394.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/32722120921.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15766414702.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/12494178482.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/ac15afd119cb1f378b94270ed4ecd720/buladofomogu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c5006a240ab---28302209074.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/36145882613.pdfIn PDF document text
    • http://xenangheli.vn/public/files/sufedisojutizujufubiraju.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/resuv.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021060803182470554.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/72058415247.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/tedawe.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/bomozarifufokadi.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/losexebasasepum.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/a916aac49ad34bde5a8eae9375dcc32e/41771634295.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kuvituvaju.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/67774548180.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4d0e3ecf81---59414389195.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9889c761f---98381560063.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/98925249962.pdfIn PDF document text
    • http://guitarenko.fr/img/files/xobogigozev.pdfIn PDF document text
    • http://dnepropress.net/files/file/53581874688.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_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 10492 bytes
SHA-256: 27ea192fbb6ac9f13aeb3efbef919b8f29573bd9d63dbff3bbd487dc36635e52
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 17064 bytes
SHA-256: 8d531a7ec0a57185b2419e84cf76d9402090f0f57663bc5b96d36513aca71dcc
font_02_sfnt_off00012793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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