Malicious PDF — malware analysis report

Static analysis result for SHA-256 6102df638f6828fe…

MALICIOUS

PDF

84.2 KB Created: 2021-09-21 21:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f214787d3dcd645c1b8a1340754bc55e SHA-1: 98669b34fa8ef72620710f869e3378a08dcabee8 SHA-256: 6102df638f6828fe51a16317341872f1ec6f805f38be941656cfed1f5ac7e919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including a link farm hosted on disposable domains and a link pointing to a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://inwebjor.ru/uplcv?utm_term=como+borrar+favoritos+en+android PDF link annotation
    • http://epmresearch.org/userfiles/files/kasebadefiwi.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161475ddc955d8---zepidojepawalolepulozix.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/tejewiwogulazavix.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/zuluxetad.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/64920851608.pdfIn PDF document text
    • http://skomi.ru/img/files/file/zefoxegepifezigobef.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/28174249832.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/37001721072.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161475498e3ed8---dixileluliw.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/kaloninetixefagako.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/57938411492.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/vaxesebip.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/88293046424.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/24481726981.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/rg5g6sd4fko49vt0eshh5va8ra/60155654603.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/rofovotudo.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/dinivate.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f24ca54b58---lododorapoporugudosupe.pdfIn PDF document text
    • http://learningkey.org/userfiles/bujeg.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109090700041105.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/bomoremegifediron.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/68421955534.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/kororoxufoduzoxopil.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/sazomakosimiwoxuzezuwul.pdfIn PDF document text
    • http://licausi.it/userfiles/files/matisewisumuzubom.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/kulatiwexexivanelupif.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_off0000e2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 18724 bytes
SHA-256: 783f111c9d95f4512a1a3e25f92abf08dfb4e2b97a49eb000733266555350133
font_02_sfnt_off00012a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A40 10708 bytes
SHA-256: a7e967475a12fb75a8ae95be4c5d6d900da63d0987ac0a809c3a1bfc534a393d