Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d10f9b53ebbdf9…

MALICIOUS

PDF

110.4 KB Created: 2021-06-26 04:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 735b0abcabfcf43c595f74bdfe57f126 SHA-1: 95baa90026e73525f070b8b08f697af82154ec70 SHA-256: e3d10f9b53ebbdf9fee02d0df0fa21e15eda5dae3093e1b97d07e2412aa9ba5c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://seoulgreeter.com/userData/board/file/zoxokoboboturoneligutaz.pdf In PDF document text
    • https://artbynela.com/uploads/file/39632477798.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/2652498279.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/89353234401.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/0c029ae9a50811e6000572125db3b8f3/nawuvajutataxubomeviwir.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/9b0045dd51e6461652a6afb0dcdfb3c1/keziselufirizil.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b38498dc9---rovaxexufawogifatu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/k899j0attreue5mbobmi2cq6o8/2571136977.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a7195b2bb---titusawejukowurusireji.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b613c2af85ac8be41861544ac6cddc18/39031649370.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/3dfe0aec16883d92347b77260b00b238/dulamabezonosabopun.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/85118735739.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/7b2dvd4e911cpd2kv5p43r5pk3/57364813022.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/51730263548.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7a8cadee5d111912124cda969d7840e2/raluweloruleviji.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1810gr5rneoelgua7aih3kff81/44714285266.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/livojiponeputulesomufezej.pdfIn PDF document text
    • https://fallsplat.se/file/kavavilariraz.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/g762ak809qbb6mf617i0csj1q6/ribedubujisezetejajedeful.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/kovixuvetaregag.pdfIn PDF document text
    • http://nktrading.qa/file/files/13653822924.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-15/20210515090624915886.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a471f63d31---31438528788.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/sp9h8b10u3envdnit4r6065nhm/nuzasoxuxoputos.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/xudekakuzukojenowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=scout+scarf+knotPDF 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_off00014d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D61 18244 bytes
SHA-256: 202b54169bcb9f2d50ff27726f9c8918a626b06be07be73e3d70455c559e502f
font_01_sfnt_off00017cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000194f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F6 10324 bytes
SHA-256: 3e6fe8676f0cd03570a8cc37f586cfb0df48b80740a11fce978872b212f02770