Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c2982236ce35e5…

MALICIOUS

PDF

73.2 KB Created: 2021-09-17 07:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 002f8e7e169f18c50dd0200835b28f3d SHA-1: b225a5fb25b64c1d6790407c6f6f4b8bcfcb3e98 SHA-256: d4c2982236ce35e5316f111766cfebf18b3d9b35a21a9d9582dba3566f0b5585
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure suggests it functions as a link farm to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://ketchas.ru/uplcv?utm_term=artificial+intelligence+benefits+to+society+essay PDF link annotation
    • https://beaszemin.com/files/52119834829.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613525a474f27---lefizejovesat.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e9f1f29ce---89816851888.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/75184388182.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/gasez.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/46124193601.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o6dvu3501jg3ctfahk7331mdr7/32453820132.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/rofonemifipiwu.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/19807395545.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/wufuvamatabudezanaz.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/bewunibisavoligupujutez.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/51810570503.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/romozikikojowas.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137b49eb8c15---dunusodosabinetinurufalir.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/81031809266.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/vunaxozaboteguwedu.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/muwelupobabirixarezur.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/54367485030.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/rarodi.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/pozozefolej.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/2914eafd9a703daccb0d876e018811ec/42558050850.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/23946305435.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/sutomajaxeda.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16143b27537cd6---zinipefereji.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/dedumopalinavo.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371a53e05cc---dodofuwitijo.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_off0000bca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA1 10744 bytes
SHA-256: 195c59a1b86fcf13ba1161238f46531c761bed28a062841b3b591d4bdb3503fa
font_01_sfnt_off0000d587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED99 16100 bytes
SHA-256: 5b3a1fbb95a44d47f733dee930a918b14a0fe974dcf9491ce45894b85eb7e61f