Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1e4973531c0315…

MALICIOUS

PDF

91.2 KB Created: 2021-07-16 10:35:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d509c22efa6c12e1334f2c7894cb725c SHA-1: 0a847404aa6afd1ca45f753f31c3b496dc7f80ea SHA-256: 4e1e4973531c03153cc7c74d784ff58bca7ae87156fcedf55ecb7e4fd05a5c0f
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous unknown URLs, many hosted on compromised CMS uploads. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicates maliciousness. The primary attack pattern involves directing users to potentially malicious external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://otartufo.com/ckfinder/tartufofiles/files/99713591755.pdf In PDF document text
    • http://elisa5888.com/shopadmin/upload/files/32064329921.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/nulebewekorezamikukaxijup.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/2df1f29afce3d8c69274b45f131f7a2c/89024245296.pdfIn PDF document text
    • http://ubest.ru/images/file/dumuvoravosomedisoradosa.pdfIn PDF document text
    • http://huron81reunion.com/clients/f/fe/feec28e48c841af8be4ad6373737a022/File/jukaporatoweg.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/70609123275.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ca783fd25---64660553161.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/dipaxo.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/mafetadizanagezuzo.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f36336bf733f6af0a01b5fb57fef977d/3324357579.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/odgau41dro6epc9qqt6oak7231/87783249715.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/cfc94b16bdd681da830991a30ff493b6/14983580280.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/levg9in2dp32jps1dal30r9ih3/guwikabina.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52c0a7577---welesumis.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/4530414961.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/21hjkq8gjsetlqvb74h0of81mq/dusobewetozatopub.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/sadizi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/b3e367b3cbfcc459c3803b761f83ee35/majifegude.pdfIn PDF document text
    • https://successalpha.team/upload/files/69528819729.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb306ab154---67552968007.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0aee75006---sisatikozikitoluxu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3099f6fc9f33cbf54a03d16a8ccd6ebf/xamafalunalufiposexezozu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16099fa1e0e362---97270462541.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a359e2064cc17411551b31a2c46d6162/17063259572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=a+person+born+with+both+partsPDF 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_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 10508 bytes
SHA-256: 3bc5931b96841f5206803ef47f9799f079e1cdf52327c4f1887d2f2a3905984d
font_01_sfnt_off000119c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131DB 17420 bytes
SHA-256: eb34002869d852f52fb2921c2e37140c598cb3f26b5ff6493ff2af54672d336c