Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eca51f334f708cb…

MALICIOUS

PDF

113.4 KB Created: 2021-06-20 03:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 45c14fa0078f07c2bc55e59b01ed14d7 SHA-1: 663b71e407a3561ee51cd1ea7c06559ae342f99f SHA-256: 4eca51f334f708cb6dc2f08c9d976ad3bae47946423b3566c997fa52984cef6a
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious content or downloads. The presence of multiple distinct hosts and disposable hosting further supports its role as a distribution point for malware.

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.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074d1a6d65d7---vagematoma.pdf In PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/99008873750.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/wufiruwipikalawepujogi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa19c91ccc---rivuxufavitexejedi.pdfIn PDF document text
    • http://mp-journal.com/media/file/zalesikuvatowusuze.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160981b3671e6e---totakigutukabisuroso.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/loseb.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/47fd87b102a44ab4f824d1ee877ff9b3/76738469388.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3cd42752---garepofifetinipipole.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607780493d98f---meveg.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071eaee262be---gilowamaledekopelufositax.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f59dec82ef22acd16d23247405a0f8dd/guzikebobetijuxak.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/fozixebemutiz.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fh56h1o50gfgfbrfs2lb5et3g/zorizanod.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607870bb39844---24005218266.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b07552e8a7---33897395612.pdfIn PDF document text
    • http://edwardnugent.com/userfiles/files/terijazopelaraxokaseke.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160801595e6d97---nozusagijemanagavex.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/~3/1KS0DP0cxss/uplcv?utm_term=hotarubi+no+mori+english+dubPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 32636 bytes
SHA-256: b8ecdfb163ac8af62b0f7ac5932dff08c9e8fc80db3c4762d12be3b01ead4fbf
font_01_sfnt_off00017f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F4D 5340 bytes
SHA-256: 0633e28ba9d63e2255c415343283387f3d309fddd13d7830e031bc0373fde324
font_02_sfnt_off0001913f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1913F 11148 bytes
SHA-256: 3218b15eac228e65271890eacb7ec4fc762fe632ea1996fc8d417b9493699eda

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