Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8506955e1a080b…

MALICIOUS

PDF

89.9 KB Created: 2021-07-30 13:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7de6de8e324ad57d8bc2afddadb8c8cb SHA-1: c12b0b9dedfe94d3b38f0cf7926d29b5818f889d SHA-256: dd8506955e1a080b2e032c0ef78d6727e65f181aba1380709ca900a0f87824fc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised CMS uploads, forming a link farm. The embedded JavaScript likely facilitates the redirection or further payload delivery. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://longhornrings.com/clients/0/08/08da48574b41509ac7bedcf2500dc652/File/kawobijazap.pdf In PDF document text
    • http://4bx.pl/public/file/tazajupamosasawi.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/de328bb56d0f3e6034dd28bf5da7570f/1881081960.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/jagemanarudob.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/wonokasebekafoxexad.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077538f30a32---wakoxolebiduzorudexuwan.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/154a8b13f53756d3929a79099d84080d/zegudu.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/julunepuwixogov.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/479644925724b0f1c7320076fc93c249/70898136735.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/94984174223.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/fulodagoworuzuroz.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/62050f2bfc535ce864b48a97c570acad/21180094306.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/16958361471.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/kofogos.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/53474172942.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/kegajutasumok.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/delosatila.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa401f78c9c---bowokes.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///naverefakubenadolusix.pdfIn PDF document text
    • http://classtool.info/upload/files/wivefazajolu.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/gebovufelivemejibemeso.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/gojabosovinajop.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/xutetanexorokexope.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/upr2olmj3c67hcd0u161tco5so/58497120710.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/23671742881.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b601d4e05ce---tolilej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=libros+para+aprender+alem%C3%A1n+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_off0000f764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 10836 bytes
SHA-256: 76c09ce140a7535d63427b76515e65ba5b0dddc4d0ee9f0c10f07b0939b5870b
font_01_sfnt_off00010fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAC 19036 bytes
SHA-256: afc1528fcb92e17d57e9d424d7e38cae5dfbafb4ca80ac95f5ed91b55c022553
font_02_sfnt_off00013f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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