Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ade10b4c56f88f0…

MALICIOUS

PDF

98.2 KB Created: 2021-09-11 22:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2db7b4f95f58075668b914521762c296 SHA-1: d437844a6eab69ff1da7ccb787b72efc822f2698 SHA-256: 3ade10b4c56f88f0ec7f6bc5358c89b4bc2fe12ce2b7f273bad458eee6a288b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final malicious destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://amdind.com/userfiles/file/wigubivapizafuxosas.pdf In PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/72445105215.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/xilipazetaveti.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/f27971eec445bd38d90106c1cfab930f/68185394645.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/xalizegibifimumilu.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16134ef976e1b7---9987426282.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/ledepijegoxatamuwoweri.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/segoburegumosajibuko.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/70186239242.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/202194_154746_888.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/11036550856.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/74759349418.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/1533043844.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/tavagex.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/bokorezexufiki.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/xatemowusasisemavef.pdfIn PDF document text
    • http://onthebroadway.com/CPD/adminpanel/upload/file/76239464281.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/14743630896.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/lamogonadi.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/tirixanukiju.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/95062894662.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/21293394574.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4da6f01e---jewamemutijunolirotebixi.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/tekosaneru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=cinema+hd+ios+downloadPDF 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_off000119f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F3 18948 bytes
SHA-256: ab554b962efdd7052cf843276fa2fe5bb331b8994010261fdf2ad1f6a343733d
font_01_sfnt_off00014bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD6 10432 bytes
SHA-256: 033a957a8aca096f8a46c844c74b77e812b10aa1ec61ab701f1acd04dbdf37d4
font_02_sfnt_off00016356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1