Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45171b7c2adf5e2…

MALICIOUS

PDF

73.2 KB Created: 2021-10-03 20:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 571a1c1b9750ef75986c426a5a23ae4a SHA-1: 4df1a00d7075aa16e24b38b00a628da91e4e54c7 SHA-256: d45171b7c2adf5e212798c2a23f701e81e15052f1d543da9ea461b6455e11661
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, suggesting it's designed to redirect users to potentially harmful content. The presence of multiple compromised or suspicious domains used for hosting these links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c762d85b2d502f684990cde932c49c73/17727998996.pdf In PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/ninarufok.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/99983c9a320cd9183801c8b7a8ddda9a/folezuxemejoboj.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/tutowidenipurexi.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210921075038_m3c5r8.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lofevewogipezulo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/a80epel29oabpe4k6fra8hg7d7/1823980876.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/32048039103.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/98635522051.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/dudapim.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/fimomajowo.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/61155729390.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/58859345163.pdfIn PDF document text
    • http://henca.com/files/details/file/84340095999.pdfIn PDF document text
    • http://labradory.pl/file/51776060340.pdfIn PDF document text
    • http://kesifveotesi.com/files/zemimulerujuz.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/mujexepoma.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/99419787367.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16144aba60702f---52114329277.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/52609790009.pdfIn PDF document text
    • https://ecowaytechnologies.com/ckfinder/userfiles/files/waruxabelixitoxota.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///jodopipanobopokoni.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/xogabuvotekedos.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/debewisanoluwenudomorel.pdfIn PDF document text
    • http://montazenabytkupraha.cz/files/file/teputupejotomanunok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=giggle+meaning+in+teluguPDF 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_off0000b7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A8 10204 bytes
SHA-256: 7a5076cf8780649524d1b1650992421f9bc23f00205e2468df6471b0d87d762a
font_01_sfnt_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 18668 bytes
SHA-256: 90484cc8e5c912b24a4d12f693e18b6628b5e9383456671c118bdcbe1f1f2302
font_02_sfnt_off0000ff50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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