Malicious PDF — malware analysis report

Static analysis result for SHA-256 5255750989c5a3bb…

MALICIOUS

PDF

83.3 KB Created: 2021-09-04 18:07:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70bc5e6e2fa95bc52c87f11b0530c5aa SHA-1: 1d5d9f7ea1906743e7fa3e4351a1498db0e5b4e6 SHA-256: 5255750989c5a3bb1fc86952eef5d1c5f91588502f78b354490c3d4dc042eea5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure on disposable hosting, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/15aa9b6ce1ade0294b4812bc90f47071/69564485302.pdf In PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/58859566bbd86fc978083800dc39908a/pulorabipugikexaritew.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/cf2153a66867b631d8c51eda5078d776/9135886617.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0f10025d5---tufufogupivelarudiguki.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/17074353863.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/35345337851.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/de561775ffc19ddc8a413398846ca381/22029003056.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/88089219090.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/86713569622.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/35672628772.pdfIn PDF document text
    • http://patroha.hu/file/6627474348.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5652223c---risite.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/duxukasuxelaku.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/e484bda9c9553db32bb0f463d6ea9b73/87826249681.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/r8g387rd40kjn63r82li1fnmrc/pubewamegamibalaxazexisat.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/82325997484.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/reguzediwofakibuvirobi.pdfIn PDF document text
    • https://network-italia.com/file/31040850745.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837fa18fe71---84468811965.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/1e69ed08a8c94ee1fa946aa4a6c29320/sebatusadit.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/gulumut.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/rexujuxuxuradu.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/22618776534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cara+flash+manual+samsung+galaxy+vPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56c8fe0665---81623199632.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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 17696 bytes
SHA-256: 6e9b6125539366949b4d6bc6e39100f9df87d686be1cd3c773a36798e878eb93
font_01_sfnt_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CE 10632 bytes
SHA-256: 7a09c59a19dfd46b107d9830fc6f4f5f706d2e52b3830433addfe8d393e2eebd