Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e208d7298993cbf…

MALICIOUS

PDF

73.0 KB Created: 2021-09-10 01:30:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cf1cf74a8217b50e1f9a97a33a5007b SHA-1: 5d26af9fb78ddbc26bf92218c01ce85ff7275797 SHA-256: 3e208d7298993cbf09730d2c1a705d34fbe2af0b1d3754e3c4dd9e516710c3d7
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination. The ML classifier strongly indicated maliciousness, and the structure is consistent with a lure document designed to redirect users to malicious content or downloads. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://air-con.ru/upload/files/gugomigaxavomonaja.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/papomevebuxelebu.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8143af784---74802843635.pdf
    • http://studiosiriosrl.it/userfiles/files/xejetodokoliresevefusig.pdf
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/dekawufawepet.pdf
    • https://dom4m.by/userfiles/files/75085798029.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/4f3237a9b48953606319c5d61044dd9b/kuwimomorijufafaduti.pdf
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/7520930711.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1633a191169067d2eaf8138ef2a8455b/47724527392.pdf
    • http://huarui-bio.com/upload/files/69450643121.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/61699255583.pdf
    • http://farmandari-sarvestan.ir/images/news/files/68593451518.pdf
    • http://jmk.kr/ckfinder/userfiles/files/1002778229.pdf
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/08dfd9d74644bd05b7a7d88e42d785ef/53717697139.pdf
    • http://tandartsindex.nl/images/uploads/74942524344.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351494d2f05.pdf
    • http://maymaygiaydachidang.com/upload/files/pobixujanofotid.pdf
    • http://saltokisport.com/uploads/files/pinifapifu.pdf
    • http://marta-galan.com/files/varios/file/61166042200.pdf
    • http://vattucongtrinh.com/userfiles/file/63850757631.pdf
    • https://texigo.tw/upfile/files/2021/09/04/39468358317.pdf
    • https://bozoklar.org/ckfinder/userfiles/files/17740338342.pdf
    • https://sofupingame.com/calisma2/files/uploads/lovejewolipatexolopur.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=among+us+mod+apk+hack+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5af.bin
21ab1c773ac6e70a0ce731e88b0cf3a165b0e336862a14e3227af57f456cb577
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AF 17828 bytes
font_01_sfnt_off0000e458.bin
cd5a1c00829946f59bf79e09f6c04bf4c804ca64a92bcad4ce616be011b7192c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE458 10796 bytes
font_02_sfnt_off0000fcef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEF 16792 bytes