Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea159e34607de43c…

MALICIOUS

PDF

75.4 KB Created: 2021-06-20 22:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 037467a6477b2454c7d3d66fb66de79a SHA-1: 9d4f8d4e3eff065269fe870f656446f3130fe81c SHA-256: ea159e34607de43c425bf80fc6df435e32c7445ef1bd1113fe3c3887039c5ca1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically using a password-protected archive pretext to conceal malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes a URL that appears to be part of a link farm hosted on compromised WordPress sites. The presence of multiple unknown PDF links and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent, likely to trick users into downloading and decrypting a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f0e52b69a---72926298788.pdf In PDF document text
    • https://kham.vn/userfiles/file/maxidukane.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/depapaxesidazebi.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/foribopafirebuluzuvupe.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/10e3c8a7dccaa953d7bc237c4e0aa30e/sudutevajowifasupup.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/44606693789.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5de1a4a79---22293025956.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a2d2090f7e47cba8c9ffae4f467826e7/13414553666.pdfIn PDF document text
    • http://ibb-online.ru/f/file/zamajunul.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f9167a37c37090e84373a2d812d1b0ee/tawarenimugikovuzari.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2eafb76343---xaxuwininulegi.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/23907792137.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/12554369514.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ae8a4f31---2745486199.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/fbbf76bc9eae8a48b433c44d609b3359/3630675870.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/55554277351.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+do+i+print+a+password+protected+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://scripts.sil.org/OFLIn 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_off0000d583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD583 5172 bytes
SHA-256: 241aa11720d5caa47d100ef668378688992b8b7018b760c2f4acb9262cc7b518
font_01_sfnt_off0000e73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73C 10732 bytes
SHA-256: a32110f4724cde50aaba6459c4c3e8225fb328f1d71697e1fc7078717f481692
font_02_sfnt_off00010bc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC2 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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