Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef86d642567447a7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 05:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ebc2bc91ca86f6c0caab3128ede1c6b SHA-1: 1b7de11a6698c0868511977dff00ec822c7fcbc5 SHA-256: ef86d642567447a77a4484689e98742e1a6db7001cb58fd6dc2734e1c29cacfd
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, including a link farm on disposable hosting and a link pointing to a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a visual download button suggests a lure to trick users into executing a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=windows+8.1+x64+product+key PDF link annotation
    • http://keralastatetailorsassociation.com/userfiles/file/bimigupolet.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/27394346031.pdfIn PDF document text
    • http://ledins.lv/cms/file/vatekakobozuxak.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/96234173533.pdfIn PDF document text
    • http://grabnerestriche.at/tapanetoxifi.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/zifuzodexatinorubi.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/xejetodokoliresevefusig.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/9193ad8b86b518415faef7e0c794abdb/67014455076.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/xololax.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/57423501650.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/gamosovubale.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/fesanenujemilofatenapa.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/xugatoxopozegejidukuxi.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210919_9982D09BD81CB5FB.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8dddd0f54aeb6dcaa73ab53328edd941/gelumugudix.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/natakukupo.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c13079b55---9127397803.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/zidupuroxelako.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/41417131023.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/71178367023.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mm4upkr3v9pbc1ht3a72hc5ivt/wevimapekulufimikiki.pdfIn PDF document text
    • https://rtaadmin.mrv-educationservices.com/content_file/files/petapininuxaridasavedimoz.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/47931760046.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/23279062821.pdfIn 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://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_off0000d8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 11356 bytes
SHA-256: 61912f67b4cfd45069ebcf3363ded170a3cd3e9bec09f56f4f766e04cc7f0f04
font_01_sfnt_off0000f3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F4 17248 bytes
SHA-256: 3a99010f53cf3d6073fd17c43e391ade6d88fae169fe5c512e44ae08ebed4ae6
font_02_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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