Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8924fe2f309db01…

MALICIOUS

PDF

85.8 KB Created: 2021-09-19 16:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4f55e9916acc7129bc096ff1cea65fc9 SHA-1: 84833cbc63f8302bbaece87191e2a0b2d4c48326 SHA-256: e8924fe2f309db0131e62a0ff7f3b6e3191ca81ca9a72af1303510a56a265c53
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to execute malicious actions or redirect the user. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to obscure the final destination. These elements strongly suggest the PDF's purpose is to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://cructi.ru/uplcv?utm_term=stupid+funny+adult+jokes PDF link annotation
    • http://whdhgs.com/uploads/file/20210910185228787.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/9697162506.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/40194299994.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/039238913314d0519ed393061e3599e3/76564541037.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6sck3mptj4s692sqhb7rd2g192/16301239368.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/roriguxexupu.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1dca709d---bodazekagavebazaduxani.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ai2ub76r9990evqo5dtg4lhbm5/lumarutozeliwunirefi.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/fepazakidowizeginibivuki.pdfIn PDF document text
    • http://koddous.com/userfiles/file/24890103120.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a696a075e---jorezob.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141c45be4294---pogene.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/mizefuketaxixapod.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/13090846448.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613897b35768a---47726881106.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109061601237204.pdfIn PDF document text
    • https://venus-forever.com/image/files/39504911024.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/3521546891.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/5035915522.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/68807540209.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dopusuxa.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/gizugivawepunaruwipus.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/puvikagaxiwiminarofunagas.pdfIn PDF document text
    • 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_off0000e635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE635 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 19480 bytes
SHA-256: aa6726f902195c17a730ce8c7580125d66827a53b15a9790341ad099667e33f0
font_02_sfnt_off00013064.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13064 10904 bytes
SHA-256: dbb7855a29948ea4d221fe0f06874f050e0347f72dbc13d9468b914604b69116

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