Malicious PDF — malware analysis report

Static analysis result for SHA-256 5baec8e24647655f…

MALICIOUS

PDF

84.9 KB Created: 2021-08-22 00:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 780a66af9de67a44939fb01530f88de0 SHA-1: 68aa97725f53971ce29d79135beea16ccf5c7b08 SHA-256: 5baec8e24647655ffb0292e2c75c8162747b5c6bc72e88fbb73eba7e11596db9
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites, which serve as a link farm. These links likely redirect users to further malicious content, such as other PDFs or phishing pages, as suggested by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a8903c0e72298cdf9d0afffd04fd52ba/risikuretobafu.pdf In PDF document text
    • http://planet-for-events.de/userfiles/file/girozebufiturimaredam.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16078b3ab0c5ac---juwubiwedozevonexi.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737bcd158f5---31309796511.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/mccof2mgs00hjj5taqsotto7r8/gakanadifaluvesuvab.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/sejozefibive.pdfIn PDF document text
    • https://masihpt1.com/contents//files/vizapizeduwinedotanup.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/limiworexefofaxifurenod.pdfIn PDF document text
    • http://jaatkinson.com/userimages/46836609421.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/fewiguzetilura.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/64517127026.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/sowubuzowemero.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/vapak.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/v178v1ji5f41jenma1d89ml335/napibew.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/45512859087.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/25838286575.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607641130df78---xosikezaganeviwek.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/pexowimagemuvepaseletabez.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8218789384.pdfIn PDF document text
    • http://rinsacars.com/files/others/57327287699.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/161046c9a228d9---dikipelobesekizek.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/wifek.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607695e196d56---pukamibejelago.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/javutixe.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f37d325ef0df6258362313d4e8f8aa97/vegunidopivarazopeno.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=la+lengua+de+las+mariposas+pelicula+online+latinoPDF 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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 10916 bytes
SHA-256: 6d5afb22e5ca3ab6ff695270a00e79bdd13e48aa5cda44081cb9630436d9ea15
font_01_sfnt_off0000fd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8F 17724 bytes
SHA-256: e31e7b3c3f14538868678b361f7137548c699cb87740f4163a86c52d8a7e42f9
font_02_sfnt_off00012a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1