Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bf6780ef2ed69f6…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 02:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: faa7e60cc5694c3e4ca77b95070da2b1 SHA-1: ea89414ee26a2d1a8e9ebbc8ebfc760cc6240a9e SHA-256: 8bf6780ef2ed69f6bcd134b22d3aacb751d3f30f9d0ebfd4e0e1335556b187c3
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 malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

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 http://www.sudaff.com/pics/file/ratixaradabupetilabiz.pdf In PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11582194428.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/33629ef0c72dd9abbbda9902ceab3010/matimudotex.pdfIn PDF document text
    • http://technocom.pl/editor/file/9479023512.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc729e616---xawekivigufupoj.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jsup4nl6dm6an7g54s8v5tolsr/nesixejomefunarojad.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/nitipowinifof.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/76512463013.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/88917147732.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fngtkc47ahbig2tnm8gk2grl9s/xavodasufubemimafa.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210522022805963813tzsx2a.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/vewugiboguroxixow.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/lufiduburepetusixifiz.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e9492463---betamowopupuludileka.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/mekuxezi.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/xijagofiboxusojaxonif.pdfIn PDF document text
    • http://fohow77.ru/upload/file/xetojizij.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/jawatujufivivibotatijop.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b458ef5abbc---91252319967.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e845057e9---2023987857.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210725042911.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/piwoxonefinowubivizujiwi.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce09a9792d---vabuzepulubu.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/44555209323.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/dezox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bingo+sheet+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_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF989 17580 bytes
SHA-256: 47753b0651cc19c37c8e14423bb52da2893963bbca9de25366383a85de5d10d8
font_02_sfnt_off00012741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12741 10524 bytes
SHA-256: ae1e309630c3ee7b06429dcbb0e4c60ff5934544afbc61bff4f1905c63de81bf