Malicious PDF — malware analysis report

Static analysis result for SHA-256 e807d0ac7ebd1d53…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 21:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2fd307866031b2ba9f3b0de75be8bc32 SHA-1: 5c80a500bfa005a9cb7bf075d93b9352cdb47f53 SHA-256: e807d0ac7ebd1d5335d02e63b4b477d02e30533137be517ca856d9ce0307986b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness, and the structure suggests the document is designed to redirect users to potentially harmful content or facilitate further exploitation. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • 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.
  • 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://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/700aff6e6ac1b18935674a90577bc9ef/wativede.pdf In PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/340283814.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/vofatepa.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/tagakizariparok.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16097908421e92---zeziwosexofabew.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/60600326194.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/5b9a81ce1b7875ec84a6b322a3e4902d/lebidanitunine.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/rakagofeletoje.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/41304312215.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/67128754254.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/aru420tmgo6jrmhq4hqvf339r3/29694836620.pdfIn PDF document text
    • http://enricobarraco.com/files/28945026950.pdfIn PDF document text
    • https://aedwea.com/upload/foto/ravopoxabugajusar.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071815279db8---vovawunilodud.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609aad8a0bbd7---28777131975.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/56119565092.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/sigitemuseku.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/197245150.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/wefufijirida.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/nubobeku.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/simexelurajixunosakofo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/66721770705.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=user+acceptance+criteria+examplesPDF 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_off0000d216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 17560 bytes
SHA-256: c16b032ffaab1b0a22ed300e2a087d4076864f7d1b754f38c4a334668236cf25
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 10524 bytes
SHA-256: dc33c3cdd2761f27c1ea4a80b34dbdf3734f38f3c5471966f25e2e5236913193