Malicious PDF — malware analysis report

Static analysis result for SHA-256 72071e5715ad047c…

MALICIOUS

PDF

95.2 KB Created: 2021-08-12 02:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 180c738483dedfc577ecef64526ecc58 SHA-1: 230968d28b6fc2bd85a028c06d0d9b39e0c1f136 SHA-256: 72071e5715ad047cbfd4450a2ea3c931faa01e10dffc3b58b39ca7bf95bdf946
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The primary function appears to be acting as a link farm to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gelateriacool.it/userfiles/files/72572894130.pdf In PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/lesijegi.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m1euab9j7a8g02bikbfa1l40b2/xipiwujemexujopelakopazap.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c112aab3ee---goxokokiwasazijanazapajuw.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/95478388362.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abae23ceb8---furowugidixiz.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/e967321eb5b87206554de564516f561a/35401625564.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/viliwaviwirutonipemijexes.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pakon.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/87115972189.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/r8dsmgas55fbcr8vqk1mq33t29/97207859800.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e583d3f038---fekelosubewemakadop.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/tiforene.pdfIn PDF document text
    • http://axwelindia.com/uploads/zifanow.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3299a57a84---94647618011.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/sumevojiwikudafowukudo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/srucg2mpnofj38unfms94s0jr4/97809570605.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8oqg8aoisdbt9hnjbn23o6oq67/xasirovifi.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608bdc42ebbbd---wifuxo.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/javeki.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/63614237833.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/aa51c4c4a87e7a088d5d11dae15fe0d0/lukebilizexijofomaz.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/54653820572.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/jedotepelaxexuvaxutiloli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=2020+shortwave+frequency+guidePDF 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_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 11368 bytes
SHA-256: 893577af5c9c0a43c9e25b3257b9feaebee4f5e9a257889f3dbde0156d985851
font_01_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 17728 bytes
SHA-256: 4b66413a21bfb6c07e67cc5dfc5229f4a7e39c7ee90597cba94fd4eb012b0641
font_02_sfnt_off000155a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1