Malicious PDF — malware analysis report

Static analysis result for SHA-256 38bb8de517ab6525…

MALICIOUS

PDF

69.5 KB Created: 2021-09-25 17:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ffa6e189d2744c7187d75ed099bcdc61 SHA-1: ae28dc3ebfed3f1f463273946918b74e230be0af SHA-256: 38bb8de517ab6525e87cb51dc6d8947a49793f9d1d0e1f26d337920289312d23
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm on disposable hosting, suggesting a deceptive purpose. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aven.su/userfiles/file/towupisutofijikegabogaxab.pdf In PDF document text
    • http://autosoftware.company/autoresponders_images/files/44948676286.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bokafumoxepako.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/raberobagizipige.pdfIn PDF document text
    • http://kunbot.com/upload/files/wezemifuzawepof.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/ode9cgjlitk7tcff7u7dscn7o5/pikekufirulitedogobugepep.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-20/20210920082731487631.pdfIn PDF document text
    • http://ed-union05.ru/files/file/nuwoxuxixedaxe.pdfIn PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/69403379384.pdfIn PDF document text
    • http://newo.ru/files/files/19614984471.pdfIn PDF document text
    • https://nexusmediation.nl/files/14329029374.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/sopumamona.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/54891814180.pdfIn PDF document text
    • https://pvcmikser.com/upload/files/70433099710.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/petatinalada.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210925204223.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/rodiwafetupegelasewosi.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/17388547111.pdfIn PDF document text
    • https://rajaunited.com/contents/files/wunotizavuxofawoge.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/38810672421.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/8805334624.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/71341337633.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/ilivtsbo91ju69mdvj3vthehbm/sitawame.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7fc56b220bcb8b4a0d2882b60b8e5f98/zibadovuzusegude.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+android+imei+numberPDF 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_off0000b06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB06E 15676 bytes
SHA-256: 95eec3debfdc5e0d98274256408fa2cddb217c663f0fdd5286526c9506ad980c
font_01_sfnt_off0000d826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD826 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 10696 bytes
SHA-256: a0c8e8d3edb4ff12579951c6df1ca0d5c3260bcb67474fa3bc0e522cd9287a05