Malicious PDF — malware analysis report

Static analysis result for SHA-256 889a9fd54e847260…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 14:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 561c3f0aef5f0c903a651ff0e468ec8b SHA-1: cc51ee16a96b87127f73036a0014aea4b0e3ccc1 SHA-256: 889a9fd54e8472608f7b14d3ca6133e86516fa88c4089784c77193b39f3f494c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of websites, including those hosted on compromised CMS platforms and disposable domains. 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 embedded URLs suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=contest+of+champions+unlimited+units PDF link annotation
    • http://nicolalazzarotto.com/userfiles/files/22115268626.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/53614216819.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/xubumufokorewod.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/67820827804.pdfIn PDF document text
    • http://domario.ru/userfiles/file/juduvofumujowawijuwibufa.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/fuwilatawatebuweretamu.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/lariluditukim.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gemamokazosetatisa.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/24982940114.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/56080000134.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/25442315611.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9bd9559a---wivedexotozaduvukobapu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/4655c86a4790815311569fbad5b859c1/52227872189.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/41773124014.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/xateku.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/2966405495.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/71h1bqfgg0ghou4np9c7huben4/37612563393.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/xudelozojot.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210910_092936.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/vigitotubejag.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/sawuzujagodoluzemu.pdfIn PDF document text
    • https://dptech.vn/uploads/files/62351307819.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/zebugulofugusulinikel.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/mivexoketum.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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18A 10916 bytes
SHA-256: 1c15f6c4b22e0298e473eda20b2521f43071ed973872f93f7ed035d4662bfddc
font_02_sfnt_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 17776 bytes
SHA-256: e6d4cc42180c99719bcec8c604bebf733e01a5f170cab8e90b50b68144862a85

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