Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfde8b797c4376c6…

MALICIOUS

PDF

87.6 KB Created: 2021-09-19 12:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dce386cc1434be29cbe2d08deca84578 SHA-1: 7d7055b9baa47bdaa62d6aada5b6d283e3f3c7a9 SHA-256: dfde8b797c4376c64860d261e086dbd7bd34979e0922e26159db647a8cfe0cc0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The embedded JavaScript likely serves to redirect the user or download additional payloads, contributing to the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ketchas.ru/uplcv?utm_term=best+action+games+for+iphone+2020 PDF link annotation
    • https://cristalparkhotel.com/ckfinder/userfiles/files/megabisedixenifur.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398c8a6a09a---85195461439.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/tirotodurulifagopebogudav.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613645ec498f7---17649530242.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/vezikuzo.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/tiliwapomuwexigepi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/jimerazesazimitet.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/bceca385c4df83ea59a7f13d66d8dc67/64584630588.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dixufokebowepagez.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/juzuvijunidebogenosi.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/damamumeloderowoxipikijis.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/19435854876.pdfIn PDF document text
    • https://kapefashion.com/files/files/38542549160.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/febawefulepiw.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/37626184794.pdfIn PDF document text
    • https://dafelia.com/files/94471209102.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/kesopamib.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/32889348972.pdfIn PDF document text
    • http://xn--80aap0abfiql8h.xn--p1ai/admin/ckfinder/userfiles/files/lapal.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/94727677310.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b04ad49e8---kanogafixoji.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/ralanerex.pdfIn PDF document text
    • http://www.dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/92394468184.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_off0000efe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FE 11176 bytes
SHA-256: 308eab0039184aab8ff1f6e9955011826c8f9915b7b2d430a3b28f92a1447710
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 18088 bytes
SHA-256: 019eb92b9dbb8036b2772baa0580a9e9f480fe36d09672ab7af2110d188c8390

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