Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b13d6948fc2121…

MALICIOUS

PDF

91.9 KB Created: 2021-07-12 22:41:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53061aa6fee5bd854af4591bdfc217d5 SHA-1: b365d3969d04e77868e1db979a3463a4ee2582e5 SHA-256: f6b13d6948fc212170e8372d19b19784f7a8b991eee4367dfaf6362bdab01e74
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The structure suggests a link farm designed to obscure the ultimate destination or to host a collection of malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://shinies.ru/img/lib/file/ranaduxubaradojomozuga.pdf
    • http://schokobrunnen.com/idata/44268922697.pdf
    • https://cvsc.co/userfiles/file/vufesijo.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097936050c59---roxuxoz.pdf
    • http://gancza.pl/userfiles/file/70912369370.pdf
    • http://thuephotocopytaihanoi.com/upload/files/41782337292.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3b0a4385c---75081432684.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/e338809e6e1c7b387ea3992b37dadde2/37696407416.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/63ee027ea28ee02e551c50db9e0d536b/81153393572.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/7d5bf19291faac8ba5e6aaa757e9fa92/zagasodetivifewafejadena.pdf
    • https://bouveau-consulting.com/userfiles/file/tukazuwamilabuderififijo.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/333jb8tp1r2bqfsfrrbvjq4goq/dumijazutumovoluxozevaju.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/519d5d46621d0436aff4f66d050f235b/weboraxozarudimixelo.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ac0deb2f3d9cc792ac956fffdccfefe/83456498489.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62df93ca5e---gezamolisedovubato.pdf
    • https://iwnta.com/userfiles/file/vadigulodosaba.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2912cb89f6---12085188524.pdf
    • http://gmei.lt/ckfinder/userfiles/files/19484135167.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/a68bd7093c77305e96c50e843068f594/65060761131.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ae1960dab---51578987334.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6umjstogenkn0ku15mn2tlvl5m/61498480614.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec1183d54---63546337720.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073e13bba426---22036448407.pdf
    • http://gorisum.net/fckeditor/upload_file/file/fumomukumu.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dc52c57cb0d54e7c492b362e3f15b23b/93868070019.pdf
    • http://kasystemofkarate.com/clients/861259/File/20682290949.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=coset+of+a+group
    • 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_off00010127.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10127 16792 bytes
font_01_sfnt_off00011939.bin
525c5a085afee1c78054a3ed03c6db7230fd0a207acaa226da8929958c6b68b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 18476 bytes
font_02_sfnt_off00014ad6.bin
2d64605fb944922e949f245ff5345e9a61ec46db91b45494c23fdcf9437e3225
pdf-font-stream PDF embedded font (sfnt) at offset 0x14AD6 10420 bytes