Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd5934dee1028e9…

MALICIOUS

PDF

72.7 KB Created: 2021-05-22 14:49:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5c2a581f0346a78b647543edfe3628fc SHA-1: 61fe1590e9a9f93018945517705e82aee1252715 SHA-256: 7bd5934dee1028e9a184bc81279d08ee2d4d512d2fc763e521bac42b282e7ca6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the file functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs, while some are marked benign, contribute to the overall pattern of redirecting users to external sites, consistent with phishing or SEO abuse tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d9edd171e20bce795479f8aad8ab6ef/7908984898.pdf In PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc394460bd---kujevenozowavo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/5574710139.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/disekuzap.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/eunt4ieslbp8obecdofchdtlaj/76198873949.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105100517.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071dd3fb178c---3902460921.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/81nhch34b7j5fsdtq8k509g3on/59545319603.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/8d51elgeiko72ul1fbuj903r5e/wobepejemif.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/9cjurrb61hsjgu44p2un896aub/kixiwojibe.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160747b61ae61e---fajupojuruvukepobanan.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a05262a5be3---gidixuro.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/db068h3kq976qgari7mmbirbq0/xumilogexomajefuzumexani.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/sitodimevafedopo.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/bbaa4ed2be01ab23ec8885a6669852c2/dekaparapi.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/domiwipofuvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+adjust+titleist+913+d2+driverPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 5512 bytes
SHA-256: 736229e8aa724de669713528f55b660f2f0b1a4970ae2749e8d72a44e1bbe949
font_01_sfnt_off0000f17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17D 10576 bytes
SHA-256: 3dc6081061143b9986c536f990008e38ce2b060e98df7f7db79df0102d1b136f