Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5cb322ae72db7a4…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 22:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 060a6afc645361d21586089fa52d502e SHA-1: 642e66150d246f130ef58291b1b1a74065c1d980 SHA-256: d5cb322ae72db7a4ef859d7970629dec12cfd7e550f6fa118d045ab2b1820f25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9fd34f5d4fe94703ebc1ea2ed6f709fc/82816908592.pdf In PDF document text
    • http://bamila.vn/luutru/files/bajenujadexaxivuravujov.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becd7368b2c---pexonisopakofa.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/57618794465.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/7017735560.pdfIn PDF document text
    • http://szpk.hu/_user/file/3825562028.pdfIn PDF document text
    • http://yameitecl.com/ckfinder/userfiles/files/20210725_054824.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/96b57f29185557e385efe6cc0c1fa42e/legugarivok.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/99982147728.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/wamaduji.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/48371220362.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/90f524889b44cdd008692065d3d53f4c/55870996419.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/e101eca39bd54fb9b62b52b95fdcbddd/xurasofamuxapivowuzuvibe.pdfIn PDF document text
    • http://suaups.net/userfiles/file/75752254877.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/tazubedini.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/51674640339.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922c2c063f2---janetinogopazimopisije.pdfIn PDF document text
    • http://tion.hu/upload/file/mitaxom.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/43389535884.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ddc3d60a---xurowanego.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/181280296060d6638ed1f57.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/navizolitosesidiwowizigig.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/2aajml8tkf7orkk4jduhijsd62/bipekabovikinagevukom.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/63o7d691iasq69snhlo1vs5ph1/24977341757.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/4a7b1f5di3pvcs6faa9vkj6hre/45262328999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=transport+in+vascular+plants+worksheetPDF 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_off0000df54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF54 10776 bytes
SHA-256: a446b07b18610c6c1285254cfff6ebf41ccfd008b23c0a8b8249d9f12a1ee02e
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11040 19092 bytes
SHA-256: a9d922fa2cc1e3f7527a711d6eb8be1c2f2bb4513ecd29fef10c497a2e0dbf34

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