Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e4872e931b0ad0…

MALICIOUS

PDF

80.8 KB Created: 2021-09-18 02:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7bb920791a18cb5392a77d05c16ecd86 SHA-1: 02e8a855093d4d54dd95ecb7caa94a208f3ba8da SHA-256: f3e4872e931b0ad05c93df2202099887d6c5c492dbf9a68f2ec01f3f5f284ed4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://garglob.ru/uplcv?utm_term=how+do+you+screen+mirror+on+android PDF link annotation
    • http://officeharbor.com/pdtInfo/88405199379.pdfIn PDF document text
    • http://elitacasa.it/images/file/kidekatofo.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161353b3335f67---97141223763.pdfIn PDF document text
    • https://brakos.it/file/36766471979.pdfIn PDF document text
    • http://mutitar.com/user_img/files/17799884896.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/3259916598.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pamifasujokud.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1e97243d4de93f16b670e039773af578/5830719780.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/savovevuwegoriv.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7a7f830c0746d43ff44e222f4d4c9432/8656720489.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/47241298639.pdfIn PDF document text
    • http://abwrva.com/uploads/files/sevinodugam.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/torakabukirifutiganeza.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/kelenalazak.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/e8d283f4fd3c8e007981f89fa82709d0/wivuwunix.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/65e6abbqe6tmluvh2rqkjg73j6/fuzatusasarugibezoxat.pdfIn PDF document text
    • http://standardamulet.com/files/files/nabosudanuvapadugexugegi.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/xugatalitater.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413be10fa5d---35274775707.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/juzegifovozel.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/pedibu.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_off0000d737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD737 18192 bytes
SHA-256: 49baa232a562ce5bd5543f2a12d52da87c258ddc15e2fe1ad8b8e85689624940
font_01_sfnt_off000105b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B1 10680 bytes
SHA-256: fb34f5405f189f6356bed02e89cb90ea6b17a774a85c8ced8afc2ccdb486a71c
font_02_sfnt_off00011e2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1