Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a8cd202d610aa7…

MALICIOUS

PDF

85.6 KB Created: 2021-08-15 21:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fde10c176be0b6e61d21655999a0feb2 SHA-1: eae9a8379eda00ba75fc6c90178285180c91d0a7 SHA-256: 54a8cd202d610aa7c8d86602b096043dee7747623a2669ebe8ab62297101d3f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mashura.co/userfiles/files/26092051962.pdf In PDF document text
    • http://n-production.com/upload/fckeditor/file/68940254071.pdfIn PDF document text
    • http://funperm.ru/content/file/14714181271.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/timudinovovilit.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/tebuwozikuxipugapixegu.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202106/file/biwujufivisotivoju.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/3083dc67300c7e6a47e0dd4e6f024f86/46367072142.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/34013660294.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776737c69f4---24891958022.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26cacdc882---deveviwajamavufu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/32369647660d9602bbb1bf.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611154442f358---431565275.pdfIn PDF document text
    • http://trivio.it/userfiles/files/mogizosejuvudazuwe.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/ponejama.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160da28dce1fb3---modasexiregoxolumigewinap.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c9506144c1111cd4c94388d5f53da4b9/razedulagofop.pdfIn PDF document text
    • https://steammining.com/userfiles/file/85328150348.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e07168a4dd---riruparebago.pdfIn PDF document text
    • http://istvietnam.com/rich_editor/file/lupisenora.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/5758707268.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/47312386088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=portable+pallet+bar+plansPDF 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_off0000ed4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4E 10292 bytes
SHA-256: 9782fea176e43350bd98005f8fafbec3082b1f4eca1f3bbaf30370066d44ed33
font_01_sfnt_off0001046c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046C 17112 bytes
SHA-256: b53dd9b3e2e0a92cc607841423b23d410135522872035fa7ff2010bee68388cc
font_02_sfnt_off000130be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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