Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff25fba56401bce…

MALICIOUS

PDF

102.6 KB Created: 2021-07-14 04:04:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e11ab2cd18e2f50c73c29df5dad0c7f3 SHA-1: 2e7419ddc45079e8624663d51fa1df1b76538c3e SHA-256: 5ff25fba56401bceb5c0ccd3475ee05f5060032b50bbff8474b83cad31a669e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://huntic.ru/uplcv?utm_term=ian+and+anthony+angry+birds PDF link annotation
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776b4bebff4---jiriwoteba.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/2e0adf8e0d85ea755635f02d475f640f/subajekojitesadun.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24649512776.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160734e8222dc4---ruvawolokenejewejefajezuf.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/tbl9socr9d1g11kofjpic3eqrb/punod.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/a5kajl4uefkb7c1g46ue2vqr17/likiwukutipebinonofatabi.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/48351956901.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/13738863798.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/titabamofe.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/tutanemesafubofod.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/131855921660aa0252e5370.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/nutipik.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1efecf0917edc27cc5fb67ab4128ede2/71188286216.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/52081354965.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/d1b7u2k956lk7jp642ib8dg8eb/xarimafexabatemijanixubaf.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e7c1e29fa7bd00df7a6808cd58511344/34247157573.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-22/20210622184825207508.pdfIn PDF document text
    • http://apsons.eu/files/file/74010223593.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0d88c6026---pavezimulikupunugusina.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/busikelof.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/zulujavivodivo.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b868e916ecd---92509935609.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/84980875219.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9810987b8a---zunefakoburopajuvaxone.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_off00012824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14036 20872 bytes
SHA-256: 1f3aa1ce5abf5a9f57e1ffda6218a344c85e31951aed6b40f283955f1ce8a58d
font_02_sfnt_off000175a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175A7 10552 bytes
SHA-256: f0ea15b8430f69520521c6618b03c7a87d26f2a7c1440a1ac90fa4f64e7fcfac