Malicious PDF — malware analysis report

Static analysis result for SHA-256 52ef9e249b086673…

MALICIOUS

PDF

99.7 KB Created: 2021-08-14 00:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ede41b37691af4eeb816fa65f6016b12 SHA-1: 76a8aa51027887c9ca3d31b2a146dc7cf9996fcc SHA-256: 52ef9e249b0866738313a6ef179a46afb88858d88534b0ded4e03bdf6f09a0c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a document designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://adaviestransportltd.com/userfiles/file/17030816357.pdf In PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/35364762551.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8e143d36b3269dc6b25baa8b5ed35afb/mozezo.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ccbb0ce0c---60999582807.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/bf158f0c0f536b2353039d573acf09c7/43132820089.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/63227360860.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/mowibekal.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/p191toa2hra0h5nf7j4hth3uqk/tinelusakeluzu.pdfIn PDF document text
    • http://cristalensi.com/public/File/dokofetozixoribavagis.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/61331096830.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/misoremodojagajobetimare.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/zoxijazasenireto.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c846e5f72---kukab.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/339801eb392569ff1da5f08048739eeb/3486031397.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/tomijaginuwufe.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c6339624d49f6215579812f4306ae989/zutogi.pdfIn PDF document text
    • https://viettrungson.com/media//Files/gerazakatazagiramosaka.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/62984281269.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9ab3e33e5205034f2e333061bb6cca89/26678559709.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/h770u40n6hc0u4v12g1r8g858r/8287538808.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/b0cc4d4b4c7ea6cc90d135fa8494628b/pufadoginadawewugurulibo.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/52862e8c0afa1ad48aefc7b3e173c2a1/loziz.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v3nq28nnr2t5kb9tbecgsli17a/vajobukakegugerepatitu.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/doxibagexidir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tableau+coefficient+multiplicateur+de+marge+htPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/d00aa5c5d5ceda9dfb08c58975c9e6f2/82049055419.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 11104 bytes
SHA-256: 71e84b2b6dd2718ebbff8c85ffd2d5a43a9c8e804b568179ecf8155ec976acd5
font_01_sfnt_off00011cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF1 16200 bytes
SHA-256: 3bc0da270f28ee03542827c6bfe63ef05d2dce13e35e9d71fbb8b010c39cff9f
font_02_sfnt_off000132b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC5 19904 bytes
SHA-256: b732f2e93105070910d1bc9e33511797a9c4ca9f25ca7cf81e17d9b229987c4f

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