Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6333675117105d8…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 11:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 11280148ef6c805ad328f1af2b531c90 SHA-1: 031de226ef3977cdc7b5a3fa8fcb9d417c338485 SHA-256: c6333675117105d8c275385550d3dca15497bbc4853cd24f84274d04e3815860
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier also flagged this PDF as malicious with high confidence. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://globomax.eu/userfiles/file/mapikusewoxasazipisi.pdf In PDF document text
    • https://smobiil.eu/userfiles/files/diredovoteworiw.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/84054478028.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ce4ce173---vafimapiligetito.pdfIn PDF document text
    • https://eguiders.com/uploads/71923576666.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/58124863886.pdfIn PDF document text
    • https://sibconsulting.com/contents/files/66599136673.pdfIn PDF document text
    • http://candientushinko.com/images/file/xemixeriluj.pdfIn PDF document text
    • http://sinice-rasy.cz/files/file/54070630959.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133d23932ad6---92942472149.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/70627147903.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/89294421089.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/93319803907.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327657f41f0---7231688236.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/bexos.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/33999781008.pdfIn PDF document text
    • http://p-energo.ru/content/file/kimad.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/deduvategekonatesokipelu.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/xanozekaviwoviwupanifuxu.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/wapozagagotanarobavafux.pdfIn PDF document text
    • http://ge-mak.com/files/babosonuwa.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/15029149125.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/gubojaterewomewodije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+ejecutar+aplicaciones+android+en+pcPDF 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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 18776 bytes
SHA-256: 4c832569341c6358b2e828e8f9907a623be582dc68246e4855d49e42ac3538c4
font_01_sfnt_off00010b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B04 10936 bytes
SHA-256: 17f611e116c81827e9a73c9ed825696a9782f19c6fe5678f808b35e243549ec7
font_02_sfnt_off00012452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1