Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce6b0523a7e3c17b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-24 09:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42c4de8541c65971293e2b38ca8c0337 SHA-1: 2def8132f7e927dc7a525a3d1fe7040d40207c42 SHA-256: ce6b0523a7e3c17b6340a736394fa89dc7215980a26a0030a0e0b7c0d369764d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm is designed to lure users to external, potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://ecohort.com/userfiles/files/valemurolideruworaf.pdf In PDF document text
    • http://jubileejec.com/userfiles/files/86301129167.pdfIn PDF document text
    • http://honda-vo.com/upload/file/4931610610.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/72988739098.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/69bcd7378f67564b03aaedcf3921f4a2/271995960.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/74704799827.pdfIn PDF document text
    • https://campermagazine.tv/public/file/88655788615.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614afaff5bdd5---pijevilenopamuzujigato.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/kodotev.pdfIn PDF document text
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/45290977309.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd4850398d---zujew.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/93816905542.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092109184010.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/fudugofojulive.pdfIn PDF document text
    • http://redactron.com/userfiles/file/wiwof.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/82162305946.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/9l5qcardohqga539idrgc2sovo/mevirov.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd1e7bdcf---59575399055.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9741993e5c1f4cffd0c7bafacb7c034d/70632868264.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0ddd88eec7d6d50f338a572da5942215/mujalubagogud.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/28848543541.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/53312559876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=benefits+of+rooting+your+android+devicePDF 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_off0000de47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF659 16864 bytes
SHA-256: f1dcff0d000f384c017ae24ac42a305230b00a0d0a299752a2fe59edb0790d7d
font_02_sfnt_off00012202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12202 10940 bytes
SHA-256: cabf0271fb3828f8a1d4b9d1ea503c68751ccef2b742bcd2f38cd769334275c2

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