Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d66434e5e0e028…

MALICIOUS

PDF

74.9 KB Created: 2021-09-13 17:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3777dfa6a386f3e68b1f30aaf7d768a SHA-1: 7d3019078ff699a80648cfd45f9f5927f6e12500 SHA-256: c4d66434e5e0e028ac8976fcd4049e285f889b86acbbacd20b64f52c065e82fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pustelnik-budownictwo.pl/ckfinder/userfiles/files/vubominiderebiropis.pdf In PDF document text
    • https://faktxeber.com/resimler/files/66935317732.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efa25a2f06---zenanukobuxovo.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/kolikafil.pdfIn PDF document text
    • https://clicksnepal.grnca.org/img/files/files/77807387111.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d82ead91---jezatepapajudazuw.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/xeniv.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138dacd56bb8---xonopabulawo.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/3727784702.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/69002336619.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613028455d029---nagoved.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/sujiximosof.pdfIn PDF document text
    • http://electric-kernbichler.at/fukukidom.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210907070811368851jmsic.pdfIn PDF document text
    • http://quaint-house.com/images/blog/file/61775240230.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/mebogotaku.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/48222374360.pdfIn PDF document text
    • http://optometrystaprzemysl.pl/userfiles/file/11419607488.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/70799670699.pdfIn PDF document text
    • http://barahi.com/assets/userfiles/files/suwodurogu.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c60141da3e---tatowetalowalaf.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/df189110aef062e3d20b8e020249a3e7/kilogaxuvelus.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/cd6e2caeeaabb0827d7e84873ed3b958/fikisebogorisibipagav.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/tomoxogijasetido.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/88916772917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=minecraft+pe+techbigsPDF 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_off0000c1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D2 17012 bytes
SHA-256: 8c4b2d387dea51dd8311d1cf269bf29c7f7a2eed6ea8ea21c0139f470390f737
font_01_sfnt_off0000edb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CF 10728 bytes
SHA-256: 97d8b49b323c5162a72f57a33387d9ed24114ec4d69018d8b63e936444b2f73e

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