Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc99f0b65fedc324…

MALICIOUS

PDF

103.1 KB Created: 2021-06-28 11:31:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7c9f65f10d902745e27cc2dc051ccf37 SHA-1: a0cfd58f5316e10c9bce8d83ec034e42c01f66cd SHA-256: fc99f0b65fedc32471beb6931005ce1f5de56cf3bef4cd146084494fd26988e8
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 attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads. No scripts were extracted, but the heuristic firings point to a malicious PDF designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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 http://gloucesterclassof81.com/clients/23558/File/92337105393.pdf In PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/22f715b200c8252e2a9759442727bc80/kuzalirubixemux.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e10040420---wigigizuwupefemibuvamikek.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/766eoqka1tkqn51ttfjbdpsgs5/71775992482.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160940652aeef1---63231256473.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/423bf66169b89737ed11b59794e31711/nefupefi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0d714058---27885617427.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/08983qtrbr91cmhdfktbvma7j3/32865341762.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/d1f1e317e76f25cb57a98d36303fb6be/71399052822.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d59e53592---toxukeba.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/45on1am5rt3onkbibpfbsk8cal/kujeferevuvexatowibu.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/sf6tmra2knbbv257shfoi0gqid/95201660165.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8361611a7b---zujovelokefozojalunevak.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608878b47067a---77650238688.pdfIn PDF document text
    • http://geotersrl.it/file/57888397920.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/54082124430.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a37b9268ae8---43631446935.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/fuvowewowibitomofobi.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2fd54cdd---28037200660.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5dc1d177ac7767cea20f95645a7cd885/39862616126.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad96e26a5---saxoto.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3acbba89459836d9ac608a66741e0db1/nimeruxokod.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/fazavawosawenesikidejewu.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/b87e4b6a6384922b6c4dc2c8539d2001/24163313042.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vofabuxuzenetokezevuta.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/74b6fe51f71f5e8bc7c9377b05cf6277/55633327575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cosey+homes+surveyorsPDF 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_off00012e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E07 18864 bytes
SHA-256: 0b4db6e0fdf134581d8110b4f38475f7e0c7cd50afa48af0b79c9f6e293e33ea
font_01_sfnt_off00016006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16006 10184 bytes
SHA-256: 60d0935c7178eefc55a52955ae71d3bcee59e0670a61ae6737fd140aecbc948e
font_02_sfnt_off000176e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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