Malicious PDF — malware analysis report

Static analysis result for SHA-256 7699a7083196018e…

MALICIOUS

PDF

83.1 KB Created: 2021-09-08 07:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c49e3e5f60ae8e9a317e7dc575b18e2 SHA-1: 19538aba57706112bd428f8a1eaf00ab6a4dccc9 SHA-256: 7699a7083196018ea77d6d2f5ed91c006eb749e9d18686bd5880342ce64faf45
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=difference+ram+and+rom+pdf PDF link annotation
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r7c948etr9k6oj44p2v86u5nn3/64214185175.pdfIn PDF document text
    • http://thaide.org/userfiles/file/50191876340.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/9620532848.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/50702891781.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210619014744.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/tubinege.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/kesibizutu.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/8805472530.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/19e15fe627f552d7299824711c0f94fb/vagidisivimoxovepem.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/29310613392.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/15147762948.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/wazebovunijojezinigamu.pdfIn PDF document text
    • https://tsegypt.com/file/tezuguse.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107232142335154.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5c99d5a351---71641239929.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/aa840da3b26497ae38abb208a3f524c9/vogifawakakojuxu.pdfIn PDF document text
    • http://indovinandoilmondo.it/themes/userfiles//files/kosabatafagofupimazow.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/ec0d972697680338f3764a528e516d1e/bogesotoso.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/36162833570.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8d9d35cea648c60df15b9f3fefdce75d/tijagowutefegawu.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071acce5a7a2---zisok.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/64325365518.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/72161211658.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_off0000df9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9A 10472 bytes
SHA-256: 295ba3ca6fb6cf86af101384d489e9fd7f76ecf5547469e3fd51454c09a13b48
font_01_sfnt_off0000f748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 18148 bytes
SHA-256: 9f7907dc5f25ae9eb9852b4dcc8527f799e960f4fce6fa613899392074c2e2a2
font_02_sfnt_off00012698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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