Malicious PDF — malware analysis report

Static analysis result for SHA-256 9650d73fa409581b…

MALICIOUS

PDF

169.1 KB Created: 2021-07-25 00:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bc4565f750ef9377fd3467cc8e98f8a2 SHA-1: 57e7c50965802fab4cfc0ff8303d70fb32eae999 SHA-256: 9650d73fa409581b29d2c544b83d09f56fd00457e216cee9683dde4ba96219d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting it's used to distribute further payloads or conduct phishing. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/67ee220912c68ba85a4d89af5f6465d8/koxolexomofo.pdf In PDF document text
    • http://sys-svinding.dk/userfiles/file/kapawadujumutelubo.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/84308960562.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805d6c2e70f---54425236334.pdfIn PDF document text
    • http://matchonusa.com/uploads/files/nibasepukilitok.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/fowinewixazexutobamemixog.pdfIn PDF document text
    • https://isleo.com/i_photos/file/gosas.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/51771523726.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/8fdd6b1fabc079add331f609b3f0658e/92418768111.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/juzutukawomivakex.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6cb4c8e23b---75671491413.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8e78b81a---lebamoxexufogelojixule.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c050b523824947cb68d0cb6bbf0d58a9/23363423758.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/48267695212.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/19327023801.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0a7802d1f83d908257d5c93612083f73/wojufakugivurewugepusi.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9867713cf2acbc642853f6ec028db31d/mafiwalerudibiju.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/12588963934.pdfIn PDF document text
    • https://dcimx.com/files/nidexatuwitosinaloj.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/f13c6chp71qj7vcpcun4krkcmb/36595097107.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608896e9e4194---23308991338.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/dixasibunukakasawojukuk.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/gidevebawakevo.pdfIn PDF document text
    • http://industra.sk/userfiles/file/54987351336.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/19525251499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=elements+of+mathematics+for+economists+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_off00022d06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22D06 21376 bytes
SHA-256: 767affebea965b79d967983254150d877edda0b04371a163651520d0f336ee89
font_01_sfnt_off00026493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26493 10868 bytes
SHA-256: 592ca4982ad420a58ad7c4b2383ec175162629a94a927fa039d9c7357648943f
font_02_sfnt_off00027d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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