Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2fb791693a19a0…

MALICIOUS

PDF

259.8 KB Created: 2021-06-17 08:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 391c6ef8d8e1e71c69d9dff60f7349bf SHA-1: 851f13860f8905688435308e32bc951ed05fff04 SHA-256: 2c2fb791693a19a05e454715f5def5d9d6f9bf2b968b77437bdbf0e9436dfd11
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier strongly indicated maliciousness, and the PDF contains numerous links to external URLs, many hosted on compromised WordPress sites. The primary URL, https://smidgel.ru/uplcv?utm_term=conclusion+and+recommendation+in+research, suggests a lure to a malicious payload or phishing page. No scripts were extracted, but the presence of multiple links to potentially compromised CMS uploads indicates a distribution mechanism for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9834

Heuristics 4

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=conclusion+and+recommendation+in+research PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607636bb61ee5---13236643540.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/ca9ebf0ed135e8771596f44d2b5c3004/72584763010.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/kotekuwivizej.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf63b3f5ba---15440934060.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089674f2eac8---4414616840.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/lokevofedibupinelusigimer.pdfIn PDF document text
    • https://callalilyvn.com/upload/files/vakezugovejej.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/63026782929.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f90f9f659---81500590068.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b8507d3d142---92405267262.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b828648ef75---sekenomegavelu.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/libosaxosibojut.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29aa2e9f9f---toxanunukosukopuzakud.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56f71d70ed---24708424022.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003b5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3B5A5 5084 bytes
SHA-256: 5007c8a2612a506ec77ad41255cbe2e04ff6f5977abc31029cc5d448ac4136d4
font_01_sfnt_off0003c6b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C6B7 13352 bytes
SHA-256: f0f08a3615365dc86bb4538a54e81f5e81ed6a606c3b443e0c0f62a9f5915efa
font_02_sfnt_off0003f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3F250 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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