Malicious PDF — malware analysis report

Static analysis result for SHA-256 9254d3aa573d476e…

MALICIOUS

PDF

89.2 KB Created: 2021-07-18 19:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08cdb15cfd62b53e77e93d78eb7d3501 SHA-1: af0c925d13c6892c85f048413e0328d6a85584ab SHA-256: 9254d3aa573d476e4c3b973b202a3dd6bbc9f16072d3afd79f827761b051f5a6
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves tricking users into clicking these links, likely leading to the download of further malicious documents or payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 5

  • 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://quangcaowebsite.vn/uploads/files/fopupufenovepuzozapotoz.pdf In PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/41560049204.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae625006421---rujasagozonibudatiwukexo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d99074431e4---78076849097.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaecf8823f---2324553522.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0631a1a370d075f168805887403457d9/fixodegagenikowijikij.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/sutikew.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0dkr31etc9u425not5c011ia8p/pisonaxubafugikigir.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/72628712714.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/3605552346.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f2f7b0ec---godeje.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/sezopavi.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/bazaxej.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/9uuul5c1doo91j3t9udstvhuku/20104861074.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e031a7b5567---potokome.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0523713aa4---kazifom.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/0dac4a96fcc8dda5ade7d9fbffc86a79/milajelirozudeso.pdfIn PDF document text
    • http://suacona.com/clients/16856/File/balolejiladerurukiri.pdfIn PDF document text
    • http://partnercable.hu/files/laxokunuso.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87c762ea3---12341717194.pdfIn PDF document text
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/c16a103dccb323eafda048477ffeb5f5/jugumufenit.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/6dfb74937587f963b579ff8824eb834e/livorozu.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/fozexijizuwide.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/59831317409.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/73641350431.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1ac8a8da4fa85561f847548f5c809feb/46279405000.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=factors+affecting+solubility+worksheetPDF 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_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 18444 bytes
SHA-256: 3971f08a8f1e02051dab66d189adf853070388c80ef19a0bc057db5db1ccef41
font_01_sfnt_off00012529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12529 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D40 11124 bytes
SHA-256: 9ad3bdebb2c19b511089ba1acacafb2d4ba745e6176aad58980ff7e8d18a5cb7

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