Malicious PDF — malware analysis report

Static analysis result for SHA-256 2071f18ae89f783a…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 08:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b04cb734818e4e2702a9abbe3bdfa56c SHA-1: 5d8e880979e5d011485d14cbfcadd982b6e652de SHA-256: 2071f18ae89f783a9f37b91530e33342e69f08dd11993b3848f7fbaddfa5a89b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm on disposable hosting, and the presence of 'utm_term' parameters suggests a phishing or malware distribution lure. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://catamma.ru/uplcv?utm_term=drive+pdf+viewer+for+windows+10 PDF link annotation
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/2604113dcc23cfbec99cd63b23b80c4f/83479803558.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/werebemizefixakig.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3edcdd1d31819372defebccdafb97804/80140542384.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/jedewiwuwukoz.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/45426861251.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/76035506328.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c3e08348d34e9cb95aeafb5ee189b32e/43155537864.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/9dfdbf5093652882db07825d3b169d4f/76865392675.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/38b026f9f7f6d612b375c5c8e2cac720/65920219420.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210605_BCE0DCCD1F391271.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/98457943795.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/53562651030.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e263a189bf0ab89bd033dbb79ccaf49c/33805331674.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160735b133d379---30377349260.pdfIn PDF document text
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37498651844.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/68586926815.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lebavajowikazezob.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/eb4d33dad04ebde25d175b6328197a82/batoboxopojox.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b6f050b21---26700060844.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/fupimoziserinikusowora.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/wekaz.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a5d34d3f0---rodexularomosewomixat.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/30e73a02287ef909358de3465ade073d/gosijobuzisafibagewekuvi.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/jezidumelipelefug.pdfIn PDF document text
    • 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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 10512 bytes
SHA-256: e770b72ea71924c936d6d741c74ad96005f16568a656fc74d1ba82cf4497bd8e
font_02_sfnt_off00010c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C89 19980 bytes
SHA-256: ffe50e49c93f929b164de7f22ca6efd354180cbf04b4163c1b928e7a7c5e772a

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