Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc8dd9e38e00663…

MALICIOUS

PDF

81.7 KB Created: 2021-09-12 22:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 405d9e57d73939c8644f19eda1027382 SHA-1: d04e1e0595c08bb7df0c969f9eb4d3130fb21b3d SHA-256: 9dc8dd9e38e00663f16b921bc050eb0f1443f6532e9dd2478708b8559b568a50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=project+free+tv+friends PDF link annotation
    • http://koutingchina.com/upload/files/lakalirusefule.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/96873469753.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/xomin.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/vitokegagijapesudomiteb.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/39771925358.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/xetotafojaluruperinobev.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/54884433472.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/kikodebadizuden.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/nakanerironewi.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210901200009290431.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/nafot.pdfIn PDF document text
    • https://negaratoto.com/contents/files/nekasoponowawexuto.pdfIn PDF document text
    • https://yukkumpulgroup2.com/contents/files/87635328731.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a50b6606d---14676130192.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/jijiriwosonefomipipasupe.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/dedaz.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/wudojad.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/5a138e7eda7e7c801aa7e2ed5e6aadf3/62350620064.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338eedbcdf5---zaretiwawod.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/90420066604.pdfIn PDF document text
    • http://muszempilla.com/files/file/xabijiwizapavitavoxanalu.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/mifasurabemizi.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/et5ci36b0mrovbdnoqoccnqhor/tupide.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/40455278811.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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 10456 bytes
SHA-256: 831aa352ce73975a6f7cf6db74c635c1c5b32499d6d638f854b0ea79cc5e4594
font_01_sfnt_off0000f3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AB 17456 bytes
SHA-256: e4b662787db4eba384b6f817c946046026ae243af16b7063e9d78f05d0e39263
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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