Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e6be235103a861…

MALICIOUS

PDF

69.6 KB Created: 2021-09-14 04:37:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ef9cec7ab4194ae5a79e02298276079 SHA-1: 6414f84f5bd9e0b4d1c6bf53c3dc45910294b2dd SHA-256: 88e6be235103a8613f77b97e8cad4f506fd17c6c9cbe9af0d55da97fc2b9a5a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=dream+league+apk+file PDF link annotation
    • https://eastmanllc.net/ckfinder/userfiles/files/gipupidexogemibadatikagi.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090323485342.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/ravibumapefu.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/94976734650.pdfIn PDF document text
    • http://standdominica.org/files/files/52237161746.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/34101160903.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210902110255_bm9qb2thZ2F6b3ZvZG9sZXRhcGVmdWdh.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/tesanugor.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/3144325210.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/jasitepaxa.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/215amue4mr2b46o118ql98gb9t/kozumozasawetabose.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/93306571850.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/2851396021.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161318db8c16b0---14602361638.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f96afc72a2---43949308604.pdfIn PDF document text
    • http://e-menu.hu/editor_up/91723272798.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/81294189575.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/bobupilexogejamofu.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wajejurigoxam.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/25126737035.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///rekotaneropisenoxawolijom.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/jezigufapunone.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_off0000b124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB124 16068 bytes
SHA-256: ff76dfdfaea233f20e08a855a1b2a3e5c697a5ee12cd5a68be59470d06a12fd6
font_01_sfnt_off0000d9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C9 10404 bytes
SHA-256: 4de160a94012ade5325452895ced198ed51904cb1c64a43d78a6b1c1d9328e37
font_02_sfnt_off0000f151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF151 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1