Malicious PDF — malware analysis report

Static analysis result for SHA-256 422b6079aeebe3f0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 22:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 823e8e8a68e962ac957c0c9771abf85e SHA-1: d5805119eb0f5fd9d80d7143149e2b6cff4cb779 SHA-256: 422b6079aeebe3f073b847e3396ecad5dff5de2275cea1b5831db43f8b7ee616
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://jyapa.com/jhuoyue/uploadfiles/kewetono.pdf In PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/67837368697.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/74013416188.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/filulire.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145c3c1d8d2d---laresikogogexalo.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/xirivalif.pdfIn PDF document text
    • https://k31szmq42-nu28.com/contents/files/60478489589.pdfIn PDF document text
    • http://cycling-software.com/files/file/sisomalapududezef.pdfIn PDF document text
    • https://olterus.net/contents/files/45065672035.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/11656523051.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/makuguxiwiwikijuwiluvuz.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/85599991800.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210905171545.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/96627506360.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141164618cfe---nikukojiledosomubakagek.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/tazowaratosimapekaxagozu.pdfIn PDF document text
    • http://vo23.ru/upload/file/diduju.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/621002d57c16e24f03234f089b554e9a/39918830139.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/5290347131.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/52352060560.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/27529886931.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/rizukuw.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/rogudiniki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=watch+listen+to+your+heart+online+freePDF 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_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 10640 bytes
SHA-256: 703d92f0a24d4b5463f5b6a6961dfa6243300ae14402e3432ec5070ae99a9b4b
font_01_sfnt_off0000f76e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76E 17484 bytes
SHA-256: e47059b7a317336ce7485822145899f5ccd3f019a790eaa7dd4f9a45bc9ade51
font_02_sfnt_off000124e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1