Malicious PDF — malware analysis report

Static analysis result for SHA-256 c14c6e3641500fa9…

MALICIOUS

PDF

93.3 KB Created: 2021-05-23 04:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7a7d6a6ce98b05913f6bb4609c21bd58 SHA-1: ebf4a83376ebe1f4653559f7868b08bb7f891de8 SHA-256: c14c6e3641500fa9d21ab060fc652a810e7750f28524f13fdf65573ed716c36b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The document body is heavily obfuscated and appears to contain metadata rather than user-facing content, suggesting its primary purpose is to host links to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/uplcv?utm_term=boku+dake+ga+inai+machi+manga+y+anime PDF link annotation
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e3c95b05ebc38e179eafcea3bfe82174/nasupulus.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/e4cdb4f5361f33a1c8a52d88c6abf536/51339541579.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/7fbc00c46d1ea2cb6219d20f9b02b742/bisefalulunumapugiji.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/xipitokebofofel.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e058540d6c---fazexabidefaruz.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/tafav.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55c8f0c16---besosovamazisetugibida.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16096b2bea01e4---47368943816.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/c8nnt6qjvisg0n61ims4660dnn/xurejufab.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d6b110c9e382909b455fa3c8b94d2973/89872103196.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/11e2d0c0f8e5ed104e7c0dcd3cbb3744/buwegose.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084d233d4942---mujan.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160706bb780cee---922196190.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417b2d274b---fasuvekazavalidijowoza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10927 4044 bytes
SHA-256: 16d9ce2938249b2bc78e1b613ee6a877a9aece470c6c3fb12c2f0dc4d0250f1b
font_01_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 5264 bytes
SHA-256: 5eb1834363f8f987750abe711be71a0c73e5a07a2b6073a9237047445f0f4c66
font_02_sfnt_off00012947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12947 12560 bytes
SHA-256: a70b599b65bd7c091d0b4ac151b369cd2e8bfcde858d18e10e04efbf5268eaaf
font_03_sfnt_off00015278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15278 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2

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