Malicious PDF — malware analysis report

Static analysis result for SHA-256 84eeb55d9b575ef0…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 23:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b5c02fb6d630ff9d4d71b6c7f603a9a SHA-1: d1581ac173d823473f4907b28e6e5e9e57809bd3 SHA-256: 84eeb55d9b575ef0041b3f914c25aa99a9d41b466aebe4ff0e908e35bcee1cfd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains a link farm with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or redirection attempt. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate an effort to lure users to external sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://acevina.com/webroot/img/files/gopopipabelupa.pdf In PDF document text
    • https://goodline.by/userfiles/file/60688356867.pdfIn PDF document text
    • http://trubaopt.ru/content/file/debexe.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/41825371525.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/66150524641.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613567f26f20a---14804288381.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161365be2a50cd---liborarokotezojeruzeta.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/sapajemivukewed.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/70391451489.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/14576888110.pdfIn PDF document text
    • https://tidurmalam.com/contents/files/51072896209.pdfIn PDF document text
    • https://aiwcecckolkata.org/FCKeditor/file/nevobijuloxip.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/sotarexapekovojafada.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/vugupixuxipovaxezep.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/zisatinalejegufanuxi.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/pibonudolorisixetizor.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d3a9fa2fb383afc493fbd40f62bdd723/91249092140.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/87932644856.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/47434734463.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/feraxabuxigin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+2k17+for+ppssppPDF 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_off0000c14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 17096 bytes
SHA-256: 4eef5ea21beab3db2dd232702dd7e91ddfb39b68cb058073ce1ef172e6a7858f
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10568 bytes
SHA-256: 580fdff64d9341e42c7583a518b134f67af47e5a57357508372f2aea36101710
font_02_sfnt_off00010615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10615 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1