Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc04001eee1eb42…

MALICIOUS

PDF

83.2 KB Created: 2021-09-13 16:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 849b9d14971bda2d504f609cdfc300b7 SHA-1: 54ad5f0955f83f4d93476df12d63a67509e5c070 SHA-256: 2cc04001eee1eb42c902b1fdcce55c74e325a2eebfb8ad4a2bad8ba1e8b7bddf
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. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as the one hosted on kystop.com, are likely intended to deliver further malicious content or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://minerva-collection.net/files/files/79059535166.pdf In PDF document text
    • http://www.workbythai.com/admin/assets/images/jibapaj.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f14b183c1a---mefon.pdfIn PDF document text
    • http://hidramaco.com/files/files/68386132437.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/9369092116.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/caac6c85071bb8cd7c39dbbb24fa19ce/zofezefejexoxar.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/fefowom.pdfIn PDF document text
    • http://jn-zhsc.com/upload/xurotimomojidazonedik.pdfIn PDF document text
    • http://allasclub.com/campannas/file/59909369937.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/doxisojon.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/bodudegerovudatifotabojal.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/zeposujopeweguj.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/c4rftf9lfaal46jecm11qj1as6/68451947093.pdfIn PDF document text
    • https://seikai.jp/free_images/files/79354510369.pdfIn PDF document text
    • http://msiutilities.biz/documents/xewepigatewalilo.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/jedogexubezivo.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/zegasoxakelezoxefojifug.pdfIn PDF document text
    • http://tradotel-riviera.com/file/xejabikitozidiboj.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/29519413169.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210913_9AF491040F5776A9.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8571a4c210dabde0740bab9a306aae76/83057012579.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/rm2pl6pfrt84rplun8pild42mc/gujagawofapakogi.pdfIn PDF document text
    • http://vilniausgreziniai.lt/userfiles/file/76637555247.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/33787266253.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/girolivov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=video+editor+terbaik+androidPDF link annotation
    • 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_off0000e3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C0 10228 bytes
SHA-256: 4a39c59f4142f9c8b1fe1391c6348531437dc7f6f3e3f378e0ad4b01da7fb56a
font_01_sfnt_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 16944 bytes
SHA-256: 2ead6b35c2f0bbd33be64729ff383ef06d987091551ce2602ff95849ddd87bf1
font_02_sfnt_off00012702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12702 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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