Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52007bd97786ee4…

MALICIOUS

PDF

170.4 KB Created: 2021-07-22 15:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ce02f95ec82adc3498a3b50c9bc9e14f SHA-1: 6b51f574ee3f30ed59e7491821299f06cf6ba79a SHA-256: e52007bd97786ee4a6544a3d27e11c47b44ddee6c7e71a0828ea611418daa71d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal the PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of numerous unknown URLs associated with compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8695f4031---vitokoferovefu.pdf In PDF document text
    • http://polymer-optix.de/userfiles/file/46035728684.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/43f8712eda38427349e82212999dd569/mezumugu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160805135d6859---wibenezavewoganokonon.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/7444748403.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/jobomivijijanojirev.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088da9bbb900---54206852386.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16099d3af64abf---rogebinokuda.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/44129380252.pdfIn PDF document text
    • http://eramaztravel.com/bot/ckfinder/uf/files/jopotewibojikuvezoj.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c46efd39---69017114085.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c871deb3f6f---18151743522.pdfIn PDF document text
    • http://gptools.net/userfiles/file/pojuripopobosafutixipix.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/radijajufavapomeri.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c518de8e2e7---fexefokedudasetugi.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077f28bc0906---25467246209.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6983b29fa5---51002931964.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/wafatusipujokovikopuluwak.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/vamobazasaripovixedu.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/35673252580.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/foxepuni.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210704233016297.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b670cb1b07565e264c48f2e36da4e80c/zapetowuvupupafugazobafaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=crpc+bare+act+2020+pdf+downloadPDF 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_off00023ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23CE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000254f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x254F5 16520 bytes
SHA-256: 33e9bce31d9b07e4d206eaa0581e8fec2184b22d6a3d61060b267837775fade4
font_02_sfnt_off00027fd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27FD7 10852 bytes
SHA-256: e661d071e471c1ba6ffa8832d407314144147339ad9c5a4738904fd810933302

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