Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ff87da2d3c9b8c…

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 03:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 76b681ff3bd716eb27062f83015cf211 SHA-1: ed053ba56436ad0212a7551ed0449336111c3b70 SHA-256: e1ff87da2d3c9b8ce454cb73473801c8021b6fc76cd594787f8e5828551750f9
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document impersonates a cloud file-sharing service, likely to lure the user into opening it. It contains embedded JavaScript, which is often used to exploit vulnerabilities or download further malicious content. The document also contains numerous links to compromised websites, suggesting a link farm or redirection mechanism to host malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://www.espace-hotelier.com/ckfinder/userfiles/files/jatanitukepokigilusi.pdf In PDF document text
    • https://bloomeng.com/uploads/64478860118.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9814967b96231d9e033d78317981a98b/pujiralotaleramotizu.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/ranonaxe.pdfIn PDF document text
    • http://lobi.md/userfiles/file/42811822364.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/damiluzujuxipufas.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/zigobowakakakax.pdfIn PDF document text
    • https://birgatour.mn/js/ckfinder/userfiles/files/todakipaxovesazubar.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/7c8f9557614e4e2488460c500fc15a41/37342305061.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///bimefam.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/26760857686.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/pibezus.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/51338706735.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613149ce55397---31433946303.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/safunebobulinu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613799024a132---13847081317.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613420a7b78fb---45972221839.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/dizuf.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/31799808103.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/9648290958.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/62098773823.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/ruponawujosulirul.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/83159333200.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/losakajawesarajunavefip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=use+android+tablet+as+pc+monitorPDF 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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 17164 bytes
SHA-256: f2a1193f38e53e844b26d9a03db912fc4932416fa1b160d59ee476dfd0d548cb
font_01_sfnt_off000109b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CB 10820 bytes
SHA-256: 3e2994b6e21429a3bb2f3477f5d67a6bae13d9326f46dc96d834d84c607efc77

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