Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcab82a9bd876b9…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 12:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fea0e098835da154e77277ac9dcff62f SHA-1: 708ffa92f626151b975ada4a0298f29e8785d370 SHA-256: 8fcab82a9bd876b94795849941ab6a9e1491881381c109d1656b1591d1bd5351
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 functions as a link farm, containing numerous URLs that point to compromised WordPress installations. These links likely serve as lures for phishing attacks or to distribute further malware. No scripts were extracted from this sample, but the structure and embedded URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a138e90dad45f95775499b866734e504/45156981163.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608803175e7e8---tulan.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d71b3ccabb1---88444571542.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/41835051070.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/83386426543.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f60aef36e---99120561098.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/3b1c5d8cf2e7d3c3301db4282805548d/54869335706.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/54581526804.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/mezeladonu.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/016fd5337993f61728e789537170b6d9/55452945797.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/kuzoner.pdfIn PDF document text
    • https://wildnaturetravel.com/File/34247119503.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/gikedajigojexofoze.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/080057fea343d1f7b8154200171a79b4/59315967743.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/movotego.pdfIn PDF document text
    • http://ducthanhtam.com/uploads/userfiles/file/76651937767.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd7d0de63---jufonavepipikef.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/vogosu.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/ritotiravamutotopirox.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1610fd56e1ddc7---828282191.pdfIn PDF document text
    • http://brownewingfamily.com/clients/a/a4/a4d7a48ed280e719b438ae57db99af5e/File/kuwenerutumut.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac381c393---9435303418.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/18711274625.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/84574417637.pdfIn PDF document text
    • http://dalaichau.com/files/xusomukojupafotojiselo.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/6061503792.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/16839070122.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=professional+architect+cv+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_off0000b8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A7 10784 bytes
SHA-256: 3a9b2bf72fd3954072f84cb52ce678d912ad79576591ccef53cacd22c1f4fb54
font_01_sfnt_off0000d174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 15136 bytes
SHA-256: 42a37914eb183204dea5090d48ca1efcfa32f4bc758f8c5d730f759af56aff1e
font_02_sfnt_off0000f74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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