Malicious PDF — malware analysis report

Static analysis result for SHA-256 84baa081d08ddbf2…

MALICIOUS

PDF

91.8 KB Created: 2021-06-30 03:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 11857b43b23a7d92c01877668a671d68 SHA-1: d6fff0eafe9b4483181db87d93a2eb03d612ba7a SHA-256: 84baa081d08ddbf240d6abc55dd91395cfc37257a297aa039a3d4c52b7f2f067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs and link farm structure are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=nationwide+shortage+of+coins
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/25b2e8d65a5fd8ca302eb8b93a5a7ba2/ravure.pdf
    • https://africanresearchcenter.com/userfiles/file/10236793953.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/2bd4afeb3d3e5b92e29fe31c5bbd5cc1/51392733840.pdf
    • http://brandiassociati.it/userfiles/file/1923883399.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e458abf4---74192579563.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/90118417179.pdf
    • https://andrejc.si/files/file/bajefegarogesoxuwu.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c46af23e677---95456364755.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081849dac0d2---xasaxeliwiwupogukidi.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/f0dac879456cf5edc1c2dbf356688706/fikovozebefubejuzuriwo.pdf
    • http://ipsgroupjjn.org/userfiles/file/pekuzemiriwibejemogoka.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3a4396479---57669125354.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9ffadc235c957a521b6faa6feec54613/xetomekonogibusufox.pdf
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/4ernimr0tda5u6aj81m7heh7qp/36969483944.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/beraxebekazevimix.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16079178b0630a---19820642969.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb8035dd3---94130941587.pdf
    • http://faurerom.com/userfiles/file/24466301456.pdf
    • http://anvlaw.com/userfiles/file/72957819518.pdf
    • http://ankaser.com/userfiles/file/55109534250.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed2ae36142---16397927369.pdf
    • https://butterfly-propertymanagement.com/userfiles/file/9228421516.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/8f9de07cc7575d20ecdccc6c5013b924/jepamop.pdf
    • http://mstreatmentadvances.com/userfiles/files/mogunuzugumib.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dbbac6e5d4d---59216859046.pdf
    • 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_off000104ee.bin
04a0db3bd5f4e2885b7890fc9a226377b7af4d5b91e42fbe774646e1a88b1444
pdf-font-stream PDF embedded font (sfnt) at offset 0x104EE 10772 bytes
font_01_sfnt_off00011d8c.bin
492590b08ace18c6452c88fceb4c7e635eea8a36b71e4294b36df55496bbe8e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16980 bytes
font_02_sfnt_off000149ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x149AD 16792 bytes