Malicious PDF — malware analysis report

Static analysis result for SHA-256 1770ec16e4e1d0dc…

MALICIOUS

PDF

81.8 KB Created: 2021-09-05 21:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c5a4401b6ee4fdc758323d2bff837e7 SHA-1: 076c56aeef0408b37353e0d4b6c8544751df4dfd SHA-256: 1770ec16e4e1d0dccf4522f456cdb38b2deccbed2549fe33f991cd84f26e23ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, directing users to numerous external websites, several of which are hosted on compromised CMS uploads or disposable domains. The primary intent appears to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://fongyoskert.hu/userfiles/files/nanojivelugilimuje.pdf In PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/lefotilikadizoxe.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/48938804260.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1cd7a3493a8c2c9733260b733d3de000/42187174932.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/8e208d053ec2c65a62026d1dec693cf7/molifinituvenijezivozok.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2d96a382---gorusuzoxesedodiko.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/rezekaz.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/1fb67fbe5ccc1630849918b151d43bf8/lutosozolutefebafirajub.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/wimevumukavoraxojeb.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/67907360147.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca7732705c3---gumozonogos.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/miwevi.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608297c573508---zemowuwikaxidarinugutumab.pdfIn PDF document text
    • http://htwy.com/upload/file/53293683553.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/pajevipafus.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/b3th8bhc8r9gic84ik0lm4d4m5/lipevabu.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d8f854f55d40f43ff57adf8ab5cb46cc/ritipowanufofesevomada.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b837592fdf---88045458375.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/84285940327.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775075d532b---72578443259.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/71468969320.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/gibaguxuvetosunifaxaw.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/vq3uorn36rsvaf3rfesmj0lh3f/rowono.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=english+words+from+greek+and+latin+elements+pdfPDF 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_off0000d8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F4 17980 bytes
SHA-256: 809de1186cab244abc2b0b9fb51f3c302592ae30ba4c9d273a8d725b360584d2
font_01_sfnt_off000107b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B8 11108 bytes
SHA-256: 1ab03172dc7535d2e517183e08182cdb9008904742d0280dc864afb0ce9f5a51
font_02_sfnt_off00012144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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