Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fa4295f6a3d3fd…

MALICIOUS

PDF

70.9 KB Created: 2021-09-04 02:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb643b633a3bbca7de8ad75ed4439b0f SHA-1: f329355f512aaaee31532f29197e0321a9920daf SHA-256: f5fa4295f6a3d3fd8ada4a81bbb6c914981dbbf225e6c7ea51de8c19b9c8cd46
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content through a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bora.su/ckfinder/userfiles/files/ketibubupojo.pdf
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/90119794449.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43227392187.pdf
    • http://bhk-aindling.de/userfiles/files/rebidabamavolutaredujixo.pdf
    • http://dyglas.com/userData/board/file/puxilowilogexuf.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/2050as8mr2hn8pk9flf91unp95/2500502563.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853758b854d---59406963257.pdf
    • http://beamstraffic.ae/amb/userfiles/file/10155532637.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca57441ef4---80525642181.pdf
    • https://parklanehotel.asia/userfiles/file/40179892077.pdf
    • http://mikailang.net/userfiles/file/20210609025546_965964197.pdf
    • http://nedirajtebosnu.net/userfiles/file/mofevofikoji.pdf
    • https://susta.vn/userfiles/file/72704901087.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/76b6ad3db9662cfade930987bd610ccb/jiduvawatizokuvidiji.pdf
    • https://vieclamlaocai.vn/webroot/img/files/vajikaweziriwuzikage.pdf
    • http://seamacros.com/upload/file/vosimebe.pdf
    • https://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/pevigefemipupupujujoj.pdf
    • https://bio-obst-und-gemuese.de/userfiles/file/lilusufofixoronakofe.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/pirikakonunegewokan.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/842ac071631ed3383f3168f3ff772e69/loxotizepatinewubum.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f740db8e34---37065799511.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/a05e902djfs98o9v804pdfoep6/kelugubisuki.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16077e5593ac0a---58498329550.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/52672330939.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=tecnicas+de+rapport+psicologia+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b59a.bin
681ded3b81933df3270ddae4dd12c4a2f22130118e0b79c2cc5d5721605ee83b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 10756 bytes
font_01_sfnt_off0000ce3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3F 16792 bytes
font_02_sfnt_off0000e651.bin
0f6199eeb740cb0c0077edda6a7549b5f3bd7bfdff399bbb5509e6992c342a87
pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 14948 bytes