Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac26a6b17e687302…

MALICIOUS

PDF

88.0 KB Created: 2021-07-07 08:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: adb78f51dec2edb862c51d67db9728be SHA-1: 9643dce8cd00a04affc9484718e13ba5ffed4d86 SHA-256: ac26a6b17e68730219a05612a09fb6211b6afbb14aff89fbb590b83610e5c157
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://visionbrindes.com/admin/fckeditor/userfiles/file/gutukuludateliniwafibalim.pdf In PDF document text
    • http://slsnn.ru/content/files/40296266370.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160789c7498987---dajasapinuzusoraduzozamiw.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/sagisu.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/90001092119.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/kebowidet.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/4b15f85fcc312d4d3b2abdc86d2586f0/gupawakidij.pdfIn PDF document text
    • http://ellev.fr/upload/files/xuxuwuleveduxetenaxi.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160830159e76c9---buduxufopujixuv.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/vawalam.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/5a107kgae6455l1ejj6gtbbpr6/1490487523.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///vivawaxeg.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/wekozuvezebejarojebe.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/69844997020.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8dd92f9e4c767f94ff6767ddaa9cce71/jukib.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/lewumakituba.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1lc7ttfai25tcc4nc07sei71k4/60565180763.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/ximosamobivitenutal.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608072a783260---wobuluwejadefelamore.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/pawinirobimejuzowaduzetuw.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/71225748465.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/aeb534960270d831f811e737d338639c/90842529279.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/14a6cf54b70fa6145506a4a027b6bd88/59552750181.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16092579b9da90---95571699680.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b39f4d6cb8---fanepabosor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=two+tigers+2007+watch+onlinePDF 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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 18244 bytes
SHA-256: ebe31e80bf14a1b5f67a560ef1ebdb63149086d01a8d1439aec4534028d31d6f
font_01_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 10848 bytes
SHA-256: cc305002075d88175f05a076c798af81ccb553d3f012c08bd38a895617a9f160
font_02_sfnt_off00013ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1