Malicious PDF — malware analysis report

Static analysis result for SHA-256 eabba387abc7c1f5…

MALICIOUS

PDF

67.8 KB Created: 2021-05-22 02:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d608d44274adc5c37468d644e5fe1ce SHA-1: 703ae6ab955478cab8acee090c97e5068a3f0a76 SHA-256: eabba387abc7c1f57ac33c5eff3710dae46d253f200c15685d42ab6cd5135703
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress upload directories, suggesting it is part of a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan distribution. The embedded URLs and link farm structure indicate an attempt to redirect users to malicious sites, potentially for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8336

Heuristics 5

  • 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
  • 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://oniceh.ru/uplcv?utm_term=descargar+corel+draw+x3+gratis+en+espa%25C3%25B1ol+para+windows+7+full
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160898a0698c25---26260106954.pdf
    • https://africanresearchcenter.com/userfiles/file/metid.pdf
    • http://www.bufolari.com/public/immagini/file/50703831103.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ceabd8aeac---wutemufogimokif.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6577903c7---22883263569.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc1387dce---gevilokiwugaxexudirinad.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607447a5080c6---wosijus.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a33abb580---jetorupexatawoneg.pdf
    • http://eko-inwest.eu/upload/file/43840638091.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814744714d4---7608485187.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/fcf376abfc04c276baadb2acdfa8375a/somebaxi.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cab36ca4f---4156968905.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/s01n0t26csb4mmv9virci60ro5/85877591410.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/u79ad4dj9cmin9hh8v2pbu19i6/93729209419.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eb08b15f3---92589563919.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/d55ddc6fbfd6e387ff7323ac11f46507/63061678953.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096854b85ea0---95598287272.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e348.bin
10e77869ff1c0805307043d22ff801eb995d5c8e28628f78a32c1465d391d2f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 5940 bytes

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