Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f1df08d56d2cfbf…

MALICIOUS

PDF

83.3 KB Created: 2021-08-30 13:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ed2313e03881109cddf92edce79eb86e SHA-1: 5ce41a2b6edeb99bd7d868380969045219711ccc SHA-256: 2f1df08d56d2cfbff635bd8543239bd6ba1e63fedbf9b5442126cb0fbfca5f4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection 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 techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://oniceh.ru/uplcv?utm_term=10+largest+airport+in+the+world PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ab0bf12cb---nonugukowedibelizuxaguse.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f9fbdabf---84124392260.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/wumutikuker.pdfIn PDF document text
    • http://geotersrl.it/file/49240389004.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/5057cb6107f40aebeef4b93a5312c32f/benubigedaborazodenulatid.pdfIn PDF document text
    • https://progin.ch/ckfinder/userfiles/files/20343252308.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/zevipirofezu.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c19f4dc6b8b47d81ea668616b0335b36/63320600340.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/pinetunex.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/9009940693.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/zumorepidive.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/75a9d14991b80afcb9c07d24468302ad/tagimubufukeliruk.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/nadeledopovijikan.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608542af154ce---91329204850.pdfIn PDF document text
    • http://www.asslar.de/downloads/75850152156.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/85552417645.pdfIn PDF document text
    • http://humanlitech.com/files/files/zekoworesogi.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/70096922116.pdfIn PDF document text
    • https://mcsfood.com/images/file/69416836762.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/svoa0r3dnsqmh5g1l5ae9f0flo/48118569301.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/14274800033.pdfIn PDF document text
    • http://rilta.net/userfiles/files/65808421964.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfe8100ec42---ginoxulepema.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/mopof.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_off0000ddde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDE 18564 bytes
SHA-256: 70c9390a251a7d64e61625c13b63632dbd6843385801fa891008dc97fb4dfdf7
font_01_sfnt_off00010e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0D 10836 bytes
SHA-256: dfb78f3f8517ac5fcadb40fc911700c65ca36f890c049e9f5c632d7e8b17bd3d
font_02_sfnt_off000126d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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