Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7633ab8ebcdaf61…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 23:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 86a144d9cfe2b5cfb0f8d349ab62f168 SHA-1: 294c2e9de5aab2be008ce054fb1e4e324d8358e6 SHA-256: d7633ab8ebcdaf617664a3104db823ef3d271914531f0f243631abb8763a942e
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the heuristic firings confirm the presence of external URIs and a link farm on compromised CMS uploads. No scripts were extracted, but the structure suggests a lure document.

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://wastran.ru/uplcv?utm_term=nostalgia+snes+emulator PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c200dc0a6---ragobeso.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/9597491115.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161345106138aa---mebanafibasewurefalex.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/rivujukukorijogedofiliroj.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/a8a0e90a06eb0d098b70b115798e6c72/fekugopur.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/xofefedani.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/7015938354.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/18279956413.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/19083102593.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jamezawuzoxusedabodokeg.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/tigenapugu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9e4ce9717dcd12a9a3c5063068e06bb7/9291677400.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/kezuxagijojideba.pdfIn PDF document text
    • https://badoza.net/userfiles/file/pusakato.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/57580106700.pdfIn PDF document text
    • https://fishuntpesca.it/file/misewibizesugipef.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613813011a3f7---sumupodezowapogiledosapo.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/84bb086eff0fbb56b8e4da277b447ac9/50003166147.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/fuwenoluxasodolamokujesam.pdfIn PDF document text
    • http://cheniou.handysociality.com/upload/files/83262217147.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/1240876307.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/gewesetiluzipepekujiluw.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/65055439763.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16137cc005f57a---94502857651.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_off0000dbb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 16536 bytes
SHA-256: 8b5af0638c4984ef24bf9d47184dd8438f9b25631cdb0190ac097bbafa45c6bc
font_02_sfnt_off00011e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E4E 10528 bytes
SHA-256: 1cf62949eb3928b020771ec35d0b58759b5a146ce6dfbd6c8bd6169a73f19cd5