Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef8a19fc982e2d9…

MALICIOUS

PDF

78.5 KB Created: 2021-08-02 12:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e42d11e9a94a90abbf2640da6147bf7 SHA-1: 1003cd28a693c5bfb120fa8ab4888f49ea7706b0 SHA-256: 8ef8a19fc982e2d9f44dad718077a8638c5e4b4c2c8b49e4751530d1584e240b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various compromised websites and other PDF files, indicating a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://files.ibiza-ferien.de/file/82970796625.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/a8c359c3201f8245145d9d5f0f11bd5b/2651310249.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/4919920627.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e5806e749---pabaf.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/14030325016.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2c0888f6a67b5b115940cadea4dc5e3c/2286175992.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/tegenirugexaxunojolu.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/21761503679.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609188d5d942f---94037563169.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1c5afa28379a200cae1c5973bb4d5307/likagegajuwokusej.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/famusetijulo.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16071f3fe68647---32690161763.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/3864037327.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a408fea0---dalefid.pdfIn PDF document text
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/barup.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/gegoma.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/45924287377.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076def372ba4---gufesujomamudax.pdfIn PDF document text
    • https://dm288.com/slicice/file/vexupoz.pdfIn PDF document text
    • https://bamor.org/userfiles/file/jelanaxenunezuzewuw.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/jirojabopibuwapudebaker.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/23132705756.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/v36tf1dplf17e8sg0g4eocph8f/49946641790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=arabic+vocabulary+bank+madinah+book+1+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_off0000d0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BD 11032 bytes
SHA-256: 6b146d9a92c4694e5252813c4eeb360b2501680f490641a2ab22be85f6fa27af
font_01_sfnt_off0000ea07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 16268 bytes
SHA-256: 20139f242a5e1c7db3c9b248abdef27baea5971b54c173e6d2518f964a396e7a