Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d286973cae5fa87…

MALICIOUS

PDF

83.8 KB Created: 2021-08-12 06:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0cc9894bf82e5a0c51b1f5a30eaf3a03 SHA-1: bf34454d99d444eaaf64250f2446418277ec0853 SHA-256: 5d286973cae5fa87a8929964765870b7648c4abcd02ffce9a0abf2d9873f3ea6
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver a secondary payload. The presence of numerous external URIs and the detection of compromised CMS uploads point to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817a7543386---tebutesisudavumedewus.pdf In PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/77213904703.pdfIn PDF document text
    • https://ocw.tw/uploads/files/kariwawurabumuvevoguka.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9adf2d95c0690ce7b04b4cbdeb1a29de/75418287382.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/92483125538.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab67bec9427---bukelonobuwujexov.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/35jppujnf7ldqea09v0mf03q1r/depune.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29ffeafaa---69147564703.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160964cbdc4295---15223861478.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/16085de9b1ffd6---wizozabagewonik.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/24061923737.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d00642e0e---24418204412.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/981c5bd2e881b52788aa4da83f7d8030/sumotujujajodirun.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/jitanomuradifojufetaresa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bb540ce799d---rivuwatum.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/397f18b6ca9aa6fc7a9be4beca5ecf0f/93591033405.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/30280984704.pdfIn PDF document text
    • https://solo-enoant.com/content/files/files/49776711386.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/biwanuzivepaxosojazuji.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/tubonefupuwet.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/54478159907.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41f269d9e9---84203527058.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/20203369045.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/92488839771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=que+es+una+nif+en+contabilidadPDF 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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 10668 bytes
SHA-256: 0819a0811534f5415117b54eeb8e4b1d9488e8f1f9796bb4be88a9f8c4ccf7f3
font_01_sfnt_off0000fbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAA 17468 bytes
SHA-256: 004d4c3a0cab493486f7d6693a3aee29d9efcd4a0fa3906f2e110c9ba1d0f47f
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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