Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2ecd15797b08e33…

MALICIOUS

PDF

95.8 KB Created: 2021-06-30 23:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5de6c1b525fa8524a6e814671037b8f8 SHA-1: 94c8c0122f8877bcd5653cfca125ab1b84e18f4a SHA-256: e2ecd15797b08e33111adda07bd1a78953ab192daff5ee9e64dc0cfffe6b7100
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is intended to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=yellow+cardinal+spotted PDF link annotation
    • http://strategie-online.net/catalogue_dynamique/file/lemevasewi.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530869f525---36629077799.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076eb338da7e---mowitazanu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92580a815---tixukok.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/90815ba368d2a58efdd687da14922521/21575183970.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3bca7aade---88699551225.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/32192924845.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903a4f2cd93---74448733955.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/pjlhpdao8j4ooof0b4djpqkia0/xozugotilobomajotonufu.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088ffa5b0cfb---nunewapowuso.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/td5q0c5ke12h36d7qctkq98huq/tilevitusax.pdfIn PDF document text
    • https://chp-travel.ir/data/file/kalap.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/188e238ed248ad863af12b27cfa557f9/62658982921.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e96adfc40---92804462641.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/b3d438f3344b960b9c66acb17937ff6d/vawubibanekemepabodozov.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/29834695021.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/70380363723.pdfIn PDF document text
    • https://allianztc.ro/files/file/66397525450.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/m86mto8g6ojv1eq69gvdhvps65/55771598761.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/zajofirefuwisub.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba804a2221---89710104541.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/lumomof.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_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 17376 bytes
SHA-256: fa79004e8db1a1d84e00d679763edb5cc51de094119c9b31fd650c54d21aa01b
font_01_sfnt_off0001421c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421C 10576 bytes
SHA-256: 970147b9c6eaf22729b5ca605ec06edc82c8b0bb1febf8ac496996baaedc3637
font_02_sfnt_off00015a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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