Malicious PDF — malware analysis report

Static analysis result for SHA-256 32e3f6e4e1a987f4…

MALICIOUS

PDF

87.3 KB Created: 2021-07-13 09:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1eac4c9683ed272e37eb70d5c63469ee SHA-1: 0e1872965449282e818fcc47c3c97bfc673c02c5 SHA-256: 32e3f6e4e1a987f4d4afe5e5dfbc292a137a7b6fddd6fdf7fb04e4d631174278
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b25e7a5ce1---97542976633.pdf In PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/vuligovijenoje.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/5930604846.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b23273aa84629895ad0e51525f7fc628/rulomo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f4135edeb---39025588512.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/595jmnoa4s06giiei4d5e7paot/lapomofireranoxa.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ebb05a2f3---87931157077.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/jb0qetbc6jq9eg5orv5uhno37j/ninikewukuzojalok.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bfec2a69c---4776015164.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/6d7f28d8f0c7d6c649549f4ceab7e33b/1295778031.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/duzol.pdfIn PDF document text
    • https://allianztc.ro/files/file/4743278226.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/563425330c83a5bd33548d0bac279310/mavomuru.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/sipaxovewelavolabewenetu.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/49027351995.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5e84b8ee5---5829424795.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160884a807829c---xavawukorixurezitoravinov.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd4042a78---nidivabawekenewi.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609d8559e5ea5---14955511280.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/44001688380.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/dbc75e89c657349c2bd470b19b28b6ca/lejagosanibupegut.pdfIn PDF document text
    • https://robertbah.si/files/file/potepojav.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/cf9bec9b2bdebaac71b0d1e10df68a98/vawaboxoragarixedonudo.pdfIn PDF document text
    • http://detskeihriska.eu/ckfinder/userfiles/files/vulodip.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e47f057f021---xadirinomujavo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=small+business+budget+template+pdfPDF 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_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 17628 bytes
SHA-256: b43fbe262fd0e30c3a2fe2a7a10953bd60868668cd9fca1944538d360d9f5e05
font_01_sfnt_off00011ed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED1 10936 bytes
SHA-256: 58fd8d89aa0fbeaa7f391a5c437e2e0b6a03b3bfac6fc95c83eab54c61531147
font_02_sfnt_off000137b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1