Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a185180ab9f3581…

MALICIOUS

PDF

97.9 KB Created: 2021-09-05 09:25:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8a4e82ec775f926e32f50be32437e7f1 SHA-1: 4abaf6b92540bbfc8782ce8cd6593d90fe216c51 SHA-256: 7a185180ab9f35815de296ef8d2d17427e4a248bbc9af04b93b46cfae1f832a4
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links and the nature of the hosting suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://geluidsadviesnederland.nl/ckfinder/userfiles/files/45085728657.pdf In PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/80b89db48eb3d4db8f0a610b6e39b8db/jijotusetudukakibuf.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd89fb11a4---pisobatogunorozekeku.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a063931991---73687139748.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/e4e31c34cec2b5f731db8ac036ad8c99/81310604973.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/65evio42s7b8qeg5cgtho32qej/20662845842.pdfIn PDF document text
    • https://egf.tw/test2/images/file/jomijibanesusujogaju.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/vilutojiponeximigezadi.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/vojevezavunajerofepawix.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/14241366844.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/dikupabiritoni.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/suvugoxesudawugaboleviw.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/wekize.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/92ce00632db838da3efc95f148c0fb9b/pumupebemude.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6c4e23b5---52802394438.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/lalejemamudororofa.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/21711178b141e574732bf0d9c944e247/4815234477.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210728_B434FA8B0FDD1B0E.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/kazero.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210626_30A1BC97E9BF6977.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/nimomeren.pdfIn PDF document text
    • http://walthamclassof1985.com/clients/5/52/52060312c10aa816a718e90a19a6a7a1/File/45728849826.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160744fd13252d---livigiwolopat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=stepwise+project+planning+in+software+project+management+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_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 17564 bytes
SHA-256: b5afb63d16662626c601ad74353acb7b2109d79c91b13e5ce4ed1c81e80ffca3
font_01_sfnt_off000146d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EEC 11256 bytes
SHA-256: b54c674ae14500d19214f9a26827331686e1efc12754cdea2837e9fe5e698328

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