Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce37e276494e5fd1…

MALICIOUS

PDF

85.7 KB Created: 2021-10-06 18:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 282ad569b372ba810a3c10582274163e SHA-1: 7a423367631b7f3d680c9befc9a5ec883fe2f145 SHA-256: ce37e276494e5fd1b8237f9052138bbcc886888cfee96eeaee21724dfdc04285
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination. The primary attack pattern involves redirecting users through these links, likely to phishing pages or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=security+and+privacy+in+social+networks+pdf PDF link annotation
    • http://salamino.pl/userfiles/file/54572644358.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/mukikinas.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/71075178891.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/witubixomok.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/retevaxisokabixagona.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/996bb88304a98da0715cb7f0f1d2b10e/waxexegurivasegib.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/bedidumalosadu.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/8492688752.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16149ccd881650---dejubefej.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c3a9c6cbe---5645863126.pdfIn PDF document text
    • http://sdtr.mdrap.ro/fckeditor/uploads/file/14901262686.pdfIn PDF document text
    • https://anup.bo/images/files/tosibebufukabukirav.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/39730034065.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161494b1ed8f2d---25385635533.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/xawodamitominex.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161497326086d2---94344267130.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/r2tedfe0s0h68o8mntso5slqf7/golubuligetugezilojovas.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/78768298493.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/tipidizivu.pdfIn PDF document text
    • http://safetruck.gr/images/file/35839348086.pdfIn PDF document text
    • https://booburger.myagenda.cz/pictures/editor/files/80996157862.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/netigisivulipebigeliva.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/14825243263.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/28899582274.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912112654.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_off0000e827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE827 17828 bytes
SHA-256: 2c22ebd61e245bc76d909c165659de75a0664a4e75e8054f7278420cad2cf038
font_01_sfnt_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 11144 bytes
SHA-256: 23eb48351ee56defdd8d9950ae6794585495dc74ae26088fa19bb16a2a9f9a9a
font_02_sfnt_off000130cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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