Malicious PDF — malware analysis report

Static analysis result for SHA-256 7da37eb8fbd6559a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-19 09:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ef5c5d9f36cf2a79d83c3ad9768f4a88 SHA-1: 97eb617b199693ed44ed2e7d301f4c6d9decea7a SHA-256: 7da37eb8fbd6559a66e3034490c6ab78dd53d7926501093fe62f5e5529e1b6d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links indicate an attempt to trick users into visiting potentially harmful URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=parental+advisory+photo+editor+app+download PDF link annotation
    • https://santechnikosdarbai.lt/images/files/33522625252.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/peguzoj.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/gagexisopenarizezizixaru.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210905173255.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/39582797312.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/lepolegodiwutogax.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/tuxila.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345a2d29b66---3430937285.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/90000440750.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxovugatulu.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88043997254.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1614206dc0bd6f---jikun.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/69378426450.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/kokadufumanovipizepo.pdfIn PDF document text
    • http://hightopeducation.com/cms_uploaded/file/nosipegubofagupeped.pdfIn PDF document text
    • http://brenderup.ro/mm/file/86281804607.pdfIn PDF document text
    • http://e-district.org/userfiles/file/85542681719.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfa36308f---vudelajexizokezelonuxus.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/mozedamimexemumogeba.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/lamow.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/xowug.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/73786129653.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/93513034282.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/9119691796.pdfIn PDF document text
    • https://rajakedua.com/contents/files/levimepujedageli.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_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 10756 bytes
SHA-256: bf05c85deddbac899452ff5a35d02bb0f4b08d0e586548b7148d607c1a70bd02
font_02_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 17168 bytes
SHA-256: ea4d1d4d4ff07d1460b4a0190bb8d1a974365642d1b9f6df26b6c30c475ef0ee

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