Malicious PDF — malware analysis report

Static analysis result for SHA-256 4625031f438c147d…

MALICIOUS

PDF

76.1 KB Created: 2021-09-18 10:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d505140de69ba85320fd5c7776bca972 SHA-1: 96b818bf301df0ca296785a8509ad0c24a5a8863 SHA-256: 4625031f438c147dbeaba48f5463659255121be0c36ead16172ebff70b2159a7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to manipulate search engine results or distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://velocimapper.com/webfiles/file/bepupejuwogenuvezivu.pdf In PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/medunelixukemes.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/54813245434.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/ae516c57e8bd85f26c24cb9c54f4de67/24869816981.pdfIn PDF document text
    • http://artediapharma.com/upload/files/bimopuwidosixuzenijilares.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ded53fc7cb445144755b6edd42d035c2/xesuw.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/tujorafetufalidefafo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132717d99675---fizadepub.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210909134632.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/d780cokd1i4gvqmgpm67e7lvl4/motur.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/zifirexak.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/joliwarenok.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/18410414880.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/gavedawodu.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/65394970995.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/75403412673.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/vutujuxitubekumev.pdfIn PDF document text
    • https://funbugs.ie/files/file/pumebejimibev.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16130685c94290---tulutomubadumu.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/xotakogigejo.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/medegolamoxagotimenedosek.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/51789426135.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/f583d0fac447afc6a905af4bb8770bfe/gipoxitamifesisosexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=5000+diamonds+hack+mlPDF 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_off0000c5e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E6 10556 bytes
SHA-256: 2862b0b15b2b471d2179a909100390dfc67c323ce250a8a38ac3007c0578179d
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 17628 bytes
SHA-256: a53dbf20fc4d50af2419e3daf0429a14036d7e8d3228f037aa0ce854c6681642
font_02_sfnt_off00010b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1