Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f672bd100be0fe…

MALICIOUS

PDF

70.2 KB Created: 2021-10-04 06:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7269ef7627c34b891c8b7b18be48304f SHA-1: 97a0466ed5141cca200d48a8d238b468670f85b6 SHA-256: 09f672bd100be0fe616f089c9287d91631c59e5599306c0640840d2374f2edc1
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and link farm heuristics supports this assessment. No scripts were extracted, but the primary attack pattern involves luring users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://pixomot.ru/uplcv?utm_term=a+journey+of+a+thousand+miles+begins+with+a+single+step+similar+quotes PDF link annotation
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_152042.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614207efe4a27---fikesagosexewu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/523380a5c1d7bc2db0edddfa38aad1e3/teruvufowolerani.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/vedalekazexoxe.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16149de9fd6670---20642572462.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/naxoraviref.pdfIn PDF document text
    • http://wwstationery.com/files/file/zimovavoxibedidaguxabetij.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/fowejedofasubeguvuliv.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/lukafegogofofagibel.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/jobalefigimazobigopiw.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/6198378126132861ba2650.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/19759231994.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/19429336202.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/xolek.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145051b250c9---78374436720.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614675ca80955---vujorikilaledilik.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/18698436152.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/12301237019.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/famoxuro.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/30645130790.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/46183671538.pdfIn PDF document text
    • https://www.informacion-indoorclub.com/boletines/img/file/kirese.pdfIn PDF document text
    • http://velo.hu/UserFiles/file/xotujadizefirakoleze.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/99511812070.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/kozavegevalidinig.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_off0000b14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14F 14480 bytes
SHA-256: 9f70cc80a44c0122e86e4b2abbb7d633b70c0a8f52e2ef224392546fdbb15fd9
font_01_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5D 11644 bytes
SHA-256: 96ad34742d7db27f0291bddfb5e53558c941fbf6c1d86ec791051b3f312c346f