Malicious PDF — malware analysis report

Static analysis result for SHA-256 d54c591862ef4c6e…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 23:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce49c142ccdc7cf7b3e904670bd9a607 SHA-1: 2ab3bba024d24e338a86ec6e02aea86921c93ad4 SHA-256: d54c591862ef4c6e5173ecbfc37f66c8e141b295ca97cd53f93c7ed1fed2ec7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b474874a28c---budozebubejusetilebunodow.pdf In PDF document text
    • https://gachbinhduong.com/upload/file/jepasalasunigutupubinum.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/88149d5c65c7e5a1dd738abec08de5b4/70481896755.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/joxibevofigowezamutazulu.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/65be9e9c26794e5f28ba7ccc602252f8/diditotamuxafomijelomib.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/zeres.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/beberig.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/18934715292.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/molozoguvaxasapudi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/lugovijiwesevibalexure.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/a47152dfda88378c93011727998558df/nawugakinedefamoma.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/74815b647e2f5267f79e6891486c58f0/3556547463.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/48304646382.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/zabarolovukozawizupuluwo.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d4ab1d583ccf87294f3b2591558b1c16/wutamunizisazitodu.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/10653626231.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dc8c52c215b---85178233919.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d649b5d283---252712358.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/rubepalawofelaxo.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/59681766541.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///80719507524.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/piwudixajifozajosanu.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/jaxomovuvepu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0cde1d1034---43370593867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=fuchsian+groups+katok+pdfPDF 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_off0000bf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD775 10892 bytes
SHA-256: 9a8f1fe21f93afa49d93ce5e8d1b4b7e26a236f39f1af1af0a0a78a641ea54be
font_02_sfnt_off0000f066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF066 17188 bytes
SHA-256: 12d2ae4ba57c1e46bed0273d6db28bad1efe7da2e3aebfd542e4eae50f94fb32