Malicious PDF — malware analysis report

Static analysis result for SHA-256 818d00295bf7ab2f…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 22:29:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6524829ab7d2ac2d92deb21b57db8084 SHA-1: 992fedf584aa195413e4cd57d01fb02a1f28fa45 SHA-256: 818d00295bf7ab2fcbd3ce12d3ef00e46c4803db0454ccf4135cf1447400559d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised websites and disposable hosting, indicating a link farm for SEO poisoning or phishing. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and embedded links suggest an attempt to redirect users to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://archism.ru/uplcv?utm_term=apk+multiplayer+driving+simulator PDF link annotation
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/risikobudaxikofa.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbda18a51---zarizo.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/636c3d529f132cb6a544973271753841/36936378327.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a8234f6a2a2ba946eaaffebcbc92993b/6243926764.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wegisugemu.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/xabitetuzegos.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/gufalobutowi.pdfIn PDF document text
    • http://voijin.com/userfiles/files/kokebufovenikaluba.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/jizonesorevaxavobojoz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16138db1fb5622---salinalozabixukutalab.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/nobivesozaxajarufunujavux.pdfIn PDF document text
    • http://yjbiotech.cn/upload/files/luxuvifabavuxuw.pdfIn PDF document text
    • https://demircanticaret.com/userfiles/file/34639332037.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133b2c725b50---57934011682.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/peropuxaguna.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109010723187574.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/32484108501.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/5243695475.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/kisanavir.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/16237623303.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/30592742160.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/fazazijuludojelek.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/19724290236.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/198572d2b6fb22f74cf0aabb479dea38/xifuxumebaz.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_off0000d1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D4 20284 bytes
SHA-256: 96b87da7e1fc62c2805ab9c15816261977f514aaac25bb406b32a1a1b2b68cf7
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 11088 bytes
SHA-256: c2dfb06edc6c5d8dcf8a1776a79c2a4537d07b2441f0d2ad5d85c5bb15283794