Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d48cec60e1af50…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 06:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e3868e5283f065f4f430625c7e7ec6bc SHA-1: 1154061885cd862c304f0134b236753b6a2f4bff SHA-256: 82d48cec60e1af50bb37c03fe69810b177ad1cf0709ed46046e5e1d8b13a552b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it likely exploits a vulnerability or contains malicious content. The file functions as a link farm, with numerous URLs pointing to various websites, including one hosted on a compromised CMS upload storage. The primary attack pattern observed is the distribution of malicious links, potentially leading to further compromise or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://g-shocktou.com/user_file/file/bosuredakakudexunexetam.pdf In PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/45943495444.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ced56bfaa5---49484540217.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xajujojotegidorufumatafi.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/uk9m4qqv5ob2mf6ae60b8vup0k/62370681774.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/87689616727.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/susixojurewezisorepurox.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/kopitisotowiwo.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/14427147569.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/jalire.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/18047044082.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/20969409612.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52365cd0e---sasegoxowufobavuwowikim.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9khkp7fmddimu04dfea20e0132/zoxug.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/76875104646.pdfIn PDF document text
    • https://isosklo.cz./uploads/jomefenuvosoniromeluv.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb0ea4fe9d---45892659185.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c976106d830---lozolajadujekijo.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/xunipatede.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/8eg65mqvblcd4saal65semklih/konodufelovesubunu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/jupezimufalerufamerokuku.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9e43673ea---pigesowu.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877dcd65972---wafigedumanulibaximijatiz.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/ginofuk.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/51403977249.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/95728386291.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=semiconductor+devices+physics+and+technology+3rd+pdfPDF link annotation
    • 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_off0000d9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B9 17296 bytes
SHA-256: 794286e57c1ad01d20e3491731b33ee3136558b1652fcd2d05cc625521f0bac8
font_01_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E89 11592 bytes
SHA-256: 482da77a3ffe8ef44de08b07470d4c0dde05250eb4d0bc737df10df0cee84369

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