Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef1d5dd5d1edcbc…

MALICIOUS

PDF

74.9 KB Created: 2021-09-15 19:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5222bd92fc74aaf053f267eb47f28aa5 SHA-1: 93521b4c359f9c8bafca91d871c51e9e01a2e78b SHA-256: 3ef1d5dd5d1edcbc9d0d6e17edc77de0e94e7a2d6e9e3a6b013f87723ac8215f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external links, many pointing to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO poisoning to redirect users to malicious content. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pernambucoimortal.com/imagens/files/nafurosetutode.pdf In PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/wokapa.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tejasuvasutevanos.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e9a87a797---runuxilemuvomibepelapoka.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39386472895.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8a883f3d5b4d8fd310f7424cad77ce4a/63114962927.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/zumaniwufipawuzirerofo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/25nvhf0ggro51dqkrm3qrl7045/61539115118.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/sewanujiterot.pdfIn PDF document text
    • http://dieterheich.de/images/uploads/file/fodunifozifebivuwojuvela.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/lelimarewuxepiwuvanowuda.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/zovakipar.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/98444740834.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/1449685773.pdfIn PDF document text
    • http://re-media.ru/foto/ck/files/pufofegezovifulumidake.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136bf758b6dc---kejewidoruxebapujejo.pdfIn PDF document text
    • http://esangsok.com/upfile/files/61715193598.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352e12b7431---12361996998.pdfIn PDF document text
    • https://orrizon.ru/images/file/lazesiraxiro.pdfIn PDF document text
    • http://vhshf.de/File/73892239449.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/levazawejufoteredanipus.pdfIn PDF document text
    • https://zagorjeadventureteam.hr/files/rekanekogufubexu.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/80287819543.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16141aa34f0174---kaguw.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/e083b8febb33769c7018bbfff191a0fa/pifokonumatugaferawog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cheat+for+gta+vc+androidPDF 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_off0000c150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC150 10640 bytes
SHA-256: 07ed4dc0e297985dd08a1c3ebb121dbd7df6c584b69e9bdb85704d059525d9d1
font_01_sfnt_off0000d976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD976 17244 bytes
SHA-256: 7afcb4e7c812900cac241869d483c2f96df8cf29f874d929baa6dd4a58ed740a
font_02_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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