Malicious PDF — malware analysis report

Static analysis result for SHA-256 474f1efc0c40a7c5…

MALICIOUS

PDF

75.4 KB Created: 2021-09-11 01:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8bd1a94f9ab4e1ee609111f4a1789530 SHA-1: 4158a34f37f11038f3d89e13283834113143cf71 SHA-256: 474f1efc0c40a7c50bddd66d2d019d55d791329f62895aaea688108927bdb0b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=abre+tu+mente+a+los+numeros+pdf+descargar+gratis PDF link annotation
    • http://albertf.madteam.net/ckfinder/userfiles/files/wukemigisipoguzipimeve.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133540b57ce9---9470115329.pdfIn PDF document text
    • http://qapoll.com/2015/vat/upload/files/77369621066.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132cb181af79---8996871349.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/57983338516.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/tizareworijivonawotuziruw.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/nupizunejefobaket.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/81968492552.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/fubolureremari.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ltkevgbi6ha6ibikatunrkpu5/ledulenugonor.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/jozebinosa.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/lujog.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/ruladaberovorutamajux.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/fisupubixubojutovilutijud.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/25288774046.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/57259388436.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/upload/file/jevomozabesadat.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/80902907574.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/28789822359.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/96513182407.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/12604021792.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/bobarutem.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/40531317816.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/wujexe.pdfIn PDF document text
    • 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_off0000bf33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF33 18124 bytes
SHA-256: ff1ed068b9a3cb9858828f3e29c2398d56ffdf19aa7808151f76e8cfc2249c8f
font_01_sfnt_off0000ed85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001059c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059C 11184 bytes
SHA-256: 293b454ff88c3df53b7570c2ba819689b3422c82d769ce8461c1d842a13137cb

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