Malicious PDF — malware analysis report

Static analysis result for SHA-256 d535e3c1c2d4eb8d…

MALICIOUS

PDF

77.9 KB Created: 2021-08-04 21:51:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0f506756159f32fe86a3bac20bb2fa55 SHA-1: bdf7062c368cb93dcc7d6bffbe855ed632c5a469 SHA-256: d535e3c1c2d4eb8d4d32839810c519ea95c2f4501e98b121f80c0b4f8dfb002a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection. It functions as a link farm, directing users to numerous websites, many of which are hosted on compromised CMS uploads or disposable domains. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a deliberate attempt to obscure the final destination and potentially distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://salt17.com/userfiles/files/gerinomugazufeve.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa00d28c076---12531396071.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/ikl9nt5l795aob4su4cb6kptb7/sekodilunudemupiwut.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/97682327611.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/lupomimawuridoxanis.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/majozokofatoropimug.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/47821748995.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/56951277808.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/fobofumijugumosunijodunel.pdfIn PDF document text
    • https://grancom.by/upload/docs/45162827990.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/muxag.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/62714601929.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/8uqsim2lfsgkdnlmob7oduclsn/nedugelawavimifusesokoxu.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/q69pk4ni8gn9q0a42bp4rnjpn4/lopasomalazutowakeseke.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/6bu5sn5g17pkmltrumepotg5o6/89863870270.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/kubuxolon.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/rodebitaxoxedidenowufol.pdfIn PDF document text
    • http://talleresjpg.es/img/file/vosuduvutefugatexezowa.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/sebijutipe.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/anfvlum5o44dikh9jj3qr71bp3/21065605850.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca81a7d251---kobalanovidikib.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/e512af4b5985cd2bbda7fbbd371d44f8/gumovufofozavimemopadazeg.pdfIn PDF document text
    • http://ridendo.cz/files/file/wexilop.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a890b427faa---50109549014.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3be3b4906---jozexomabureru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=microsoft+excel+training+pdf+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_off0000cccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCCF 10976 bytes
SHA-256: 05eddd76f2ff8dae79228b3076e0d7c52200f039bf35e7d04b8d05977697f18e
font_01_sfnt_off0000e651.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE651 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE63 16656 bytes
SHA-256: 787ac9bb0e5d8359d34e5d6b3f6f1713b8f6d43b6bbf1dbb467bba480a6095e1

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