Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ece48b1ac798b3…

MALICIOUS

PDF

84.5 KB Created: 2021-06-10 02:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: dc7d6a41116a28f8cfda55cec317a7da SHA-1: 95f87e0a0a8ad9383fda1fb1b32cc4ea5bde9f75 SHA-256: 72ece48b1ac798b3fdc937357110499b536c333975e752611296cdcba25a6fe1
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by multiple heuristics, including ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised WordPress sites and other domains, suggesting it functions as a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata related to its creation, but no direct instructions or lures are discernible.

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://ketchas.ru/uplcv?utm_term=dashing+cm+full+movie PDF link annotation
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/dab1506691b4516cb7346a784729a081/kajimena.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/f8m9a6dr5qdpgebfja73n8s0nh/dixagoronebojemi.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/15004427609.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/44e588b937ed86d12baced897df2cc00/bivozafexusujexutus.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84ba069dc3---vewobidapopamave.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/l7ck9bb1a5netuim5q4jltt3e1/feledorazufapoval.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/gibibadisos.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/zebirupajujiwesunalavula.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098472b4bc86---1398092421.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a31b6dc5179---25677182685.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/tugebepunalesi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdc939c2c9---getokemapopakogomibos.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gukenarizefakimunu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940a9f9dd26---bajebitefugowefesokowo.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ooqg7cj5veuhsnaje1slqi3qva/83624866015.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07f9741d7---10457701504.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF993 5256 bytes
SHA-256: a7608506581dcb18fedf7b21aedb93e151323a32e34b7c9aa069d5a4e040d7e0
font_01_sfnt_off00010b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B68 10444 bytes
SHA-256: a730fa5f29ecd35237f6f44c7cb030ae55fc30854f55247310d73026ce001dc6
font_02_sfnt_off00012f9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F9D 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

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