Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7421912b6d42d7…

MALICIOUS

PDF

74.3 KB Created: 2021-06-09 12:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: efc5dd4611afde96af017ea2710e7fa1 SHA-1: c49469280f8a0cf7c29ea5e88ca12b9d45a68249 SHA-256: 3e7421912b6d42d7e81a32f5e45f6e8bd3db9de85b14a92fc31b399dc86f0410
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness. The presence of multiple external URI heuristics and link farm indicators reinforces the conclusion that this document is designed to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=muwo+jeem+shrine+location PDF link annotation
    • http://alpanelektrik.com/depo/sayfaresim/file/91484806439.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/klnlaqb32ms6vrtc6tb6bnjgr4/zomabozemetetif.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/xilipofiwalososez.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e3284116---pagifududujuvozofevixo.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/48801740915.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/s1kkgtaan1i9jdf16ki6i3vrec/kagenimixal.pdfIn PDF document text
    • http://ekotronic.eu/files/file/patupudiwe.pdfIn PDF document text
    • https://activepymes.com/pub/file/refovikel.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1a56afec8798eedf4bc14881f6b18d76/rakosodosisiwinizogaje.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5a3019b35---95780066887.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b70d3f1a43---14067304804.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/jvh8a56pplih97g9gc5glofrrq/lavivotiselusub.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8d4779bd1---silusit.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160860ec8df17a---51264494010.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/3f4396ff17271f32f0c62bf17511f922/nanef.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759204a4bc2---nabakuxogopurovadazovagi.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/94572700584.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 5212 bytes
SHA-256: 6563a66fe7232817acecdabe690da567a3d728446874c4844480665dc0d21426
font_01_sfnt_off0000f89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF89F 10676 bytes
SHA-256: 0adf830732f5dd1a5c31e76ac51fcea86d613a78dfafae956f71888d570c582e