Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4af0f2576506a9e…

MALICIOUS

PDF

87.8 KB Created: 2021-08-12 06:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c827cbd07ae8332ed950543f785782ad SHA-1: d23c68c597d42a1dfc3190353bedd6626da3597a SHA-256: c4af0f2576506a9e27bf9aef689281a0282f51ff2bb0a17075af1fc5cbee6a42
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous external URIs and links to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://garglob.ru/uplcv?utm_term=marco+antonio+solis+exitos+descargar+cd PDF link annotation
    • http://dinskayarealty.ru/media/file/pafajobikajibukogopepuni.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/rasudibini.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/parsacaj8iphb8ilvul9u4kr11/62290037253.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/xubixovobapozuvamelow.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/fokisa.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bb69a748a---13715247460.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096486e380e0---posumibefenabasunam.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2028f50e5e0b016fc0d18973b6889546/gufibatamimefipafunod.pdfIn PDF document text
    • http://mesterek.net/tmp/dorizobitodemat.pdfIn PDF document text
    • http://dsagco.com/Upload/file/21135597751.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/noredalojusipafotuxaluwap.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/vifen.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7db97b25c8---rivegup.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/sagake.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/reretadonibupavokovi.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/990eisc1oj8btv60t51842u61r/kodatulanekufosuzabirage.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/lujuf.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/20549703544.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/38094039808.pdfIn PDF document text
    • https://arbormaster.net/uploads/files/kejuxutifojisufubora.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608623192f29e---80773542706.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea5275b29a---67116970598.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/48546878227.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 18548 bytes
SHA-256: 128e91eb4043679acd2cacacaeab3849b74ab5cc749513781e8c83a74c177ece
font_02_sfnt_off0001374f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374F 10640 bytes
SHA-256: 88cc194a41a59e8c8fe1bd17122b4130154836e3306ec9ec88ac955a0acde485

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