Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8f7cea5905960d…

MALICIOUS

PDF

131.3 KB Created: 2021-09-07 20:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2116df897550f05456e0658aa1be4149 SHA-1: 89d8cfad5332d6b536e69bed2c01691de1ab51e0 SHA-256: 3e8f7cea5905960df48f2b4b44e278ead6d7a36ba81334773f070b0c7147806a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these compromised sites. No scripts were extracted, but the PDF structure and URL analysis point to a common pattern of using compromised infrastructure for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5d89cae26---jedokinalopov.pdf In PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/88050839089.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/pogawugepizadam.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/7bf4c3c3e2f7c29cbf9b789761546036/fumesunagibixirilej.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/natamoge.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/gugila.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/jiwalene.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/kulajerag.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/miwavovoxitawonosorosuvo.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/8bl9ibjlorbpickb9h32l9cp3v/1920413529.pdfIn PDF document text
    • http://sro52.ru/uploads/files/tuzusafivovarafivug.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/dofow.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a2060a7ff7b7a19c84fe791a12bdb0c4/62706105133.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee06d29a94---tetitugugatunitap.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16109644fc5178---88871629918.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/54792077274.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/105006d38d0277626b94127d7108770d/93850681163.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/vumurutap.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/44462531119.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd87fa9306---11685193142.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5m7nrac4empa7rh6nhv8ghcfmd/wovipafuzoku.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16099b6d1007d8---38475742953.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/vufikewawakevuguleziramom.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/80371775254.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612b328857571---73711029745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ralph+roister+doister+pdfPDF 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://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_off000199eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x199EB 20584 bytes
SHA-256: 3f69319ede9d1100a9b000f043fc6f9259f927eecc58ca20454c9df348746615
font_01_sfnt_off0001ceee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CEEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001e705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E705 10536 bytes
SHA-256: 4254d439ef8ab106ce829a55ea23ecbc3123c38784f8c30face1f56d407dedc6