Malicious PDF — malware analysis report

Static analysis result for SHA-256 53932dcbf311388d…

MALICIOUS

PDF

153.0 KB Created: 2021-06-21 02:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d6f1075fa6b61ca6dc18b28128871819 SHA-1: 2ea08900df25e3c4b686d885a274584050641f9a SHA-256: 53932dcbf311388deb418a8824938569c46462d0d74a990b0bea4e5889f84cc8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or engage in SEO manipulation. The document body is heavily obfuscated and unreadable, but the presence of numerous external links indicates a likely attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/tld74dlv4ii8trevs6kf5i2721/48677919290.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a8391189fb2---finazozav.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0192a999a---wixeru.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ffccc8fb---36614545641.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/76573077710.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/65856068676.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/84420973268.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/bawurajivupabopavow.pdfIn PDF document text
    • http://plncse.hu/php_data/file/90228358600.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/03/kewiminokimazo.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/nawafinekubedovomelidixom.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e1a21d8ab34c737a420eabda54a0d3c8/leruv.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160941371394af---vifepajen.pdfIn PDF document text
    • http://otoozevran.com/resimler/files/9427989191.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mary+wollstonecraft+and+mary+shelleyPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002164e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2164E 5460 bytes
SHA-256: 9744de4ff86097eb6854b33aeb4cbcf5f4e1ba7cc46489e4df2f1e02139bc622
font_01_sfnt_off000228db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x228DB 13984 bytes
SHA-256: b4bc071b1461b09ecefe4695fbc2ebde78952a6762d3dc604c5309f3839f2a2d

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