Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4cc4290c797d71…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 17:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b56ff76878217be2d3513a1ec76f0c27 SHA-1: 2b1c1b2c561d275e0076b727bd20f663b63184e9 SHA-256: 4b4cc4290c797d71a6751ca50cc7e7aeecf66c7d2f841534b54243f24a1b6fa8
164 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the document contains a link farm pointing to compromised WordPress uploads and disposable hosting, with one URL specifically mentioning 'elevate apk download'. The presence of a visual download button further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=elevate+apk+download PDF link annotation
    • https://willmarareachamber.com/ckfinder/userfiles/files/biruwepow.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/20956673814.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/56711081689.pdfIn PDF document text
    • http://midel.me/userfiles/file/78997369707.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355151dc8e4---85730890333.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d4454c161---lenomavowixijasi.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/mepewi.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_9A47888B571C038A.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/limokizimonomin.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/mebimorafenajeg.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/84010099733.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/87915988839.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/76798050437.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613ece0308e73---kowixogerasasaxix.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/3d6a5b77c25b9308e1d61919f6bd53a9/rotas.pdfIn PDF document text
    • http://stonebreaker.at/27001046484.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/vaxufifulijuzokikajexagal.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/56889760611.pdfIn PDF document text
    • https://ismart99.net/upload/files/texokaj.pdfIn PDF document text
    • http://beta-rc.com/upload/files/92879150529.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/jakizibeji.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/kedoxul.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/29792912401.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210912225913.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuwokutufejotagipivop.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/vibudorerupitubu.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/54854145664.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_off0000dca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA7 10252 bytes
SHA-256: ca5d5b5c56c86790665358d14cacc8856db87bf3cb04ca8cf310bd42c42d8877
font_01_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BEE 17492 bytes
SHA-256: a3a2c0d4e34d6ea490bdab45aafa4254ca8f34d0e14aee9d7ee77f090079d51f

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