Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b97b698d68b4999…

MALICIOUS

PDF

70.0 KB Created: 2021-10-07 00:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5830da56d73c55cadfb03358a5a3d475 SHA-1: 5948052c1b0ac2bc3d35bde4e3bc0d59eda6ba0c SHA-256: 4b97b698d68b49995f5374dc1f72f0a06dfd943654aeceb4641715c19e2df556
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to direct users to malicious sites. The embedded JavaScript is a common method for initiating malicious actions within PDFs, such as redirecting the user or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://leadershipcareer.kr/fckeditor/_upload/file/pelumuwadesa.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efb0bc72b3---63541835367.pdfIn PDF document text
    • http://ets-sptk.ru/pic/file/37912642879.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/wewarovilozugumenagox.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021092017311673499.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce6a33470c---38746364783.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/dovexokodevarujo.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202192124148469.pdfIn PDF document text
    • http://aallergy.netlovestories.com/upload/files/zupojezirekebivanilige.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/roxedilegebiduweliwa.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8ff2357e---vubafeguzikilu.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/petagowojofudajodupida.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/tufopojak.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/38099538815.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16158bb6e55d9f---segujul.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/10570512581.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/vibogarabeguti.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/65740cc4c83fe42fb0fa7a32973adf23/74829158919.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/22843161177.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/widonu.pdfIn PDF document text
    • http://hk-keber.de/images/file/jabuladi.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/9787713236.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8044a91dc090fd2bf389983195c0b096/32823935514.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=which+of+the+statements+is+true+of+saltwater+and+freshwater+animal+waste+management+systemsPDF 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_off0000b11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11B 15304 bytes
SHA-256: 0168e2b7f71b828450a74ecf9c62f82c1c6db2f074b8c7eac9b0afcdb478a06b
font_01_sfnt_off0000d769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD769 11216 bytes
SHA-256: 47495a516a4abc032d8de20ebe077a05eaa4cd623142985a0e544ddd56a1b904
font_02_sfnt_off0000f15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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