Malicious PDF — malware analysis report

Static analysis result for SHA-256 189b530979fced52…

MALICIOUS

PDF

79.7 KB Created: 2021-07-17 01:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f6821bc59a459154661319f63c7917ff SHA-1: 558f9c6798ab6e675bfae76d4371fd0837c6bf87 SHA-256: 189b530979fced527c6f447c30fc9fcbd2f7e3986b3daaedb9105233f8bfbd7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. The embedded URLs and link farm heuristics strongly indicate an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://easy2ticket.com/upload/files/91002549010.pdf In PDF document text
    • http://pivotal-technologies.com/userfiles/file/jonujuxubojonumazo.pdfIn PDF document text
    • https://ka-base.no/images_content/file/tafumoxuna.pdfIn PDF document text
    • https://baptistfriends.org/media/kigotupeli.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/75ceffd7a709d7b7866d87bd57d851a9/92576895166.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/54845788350.pdfIn PDF document text
    • http://charivne.info/images/file/23708454793.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860b5d2bc4d---kusogiruwiwitug.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c31212db2dfb88623e389567f2efeb16/34845924119.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/kajufu.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/duberix.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/jukekositi.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/gagixibuvozozofimoduzasaz.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/sotixeluwomap.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d0cc75cb941---penerubemijanupo.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/403026335938eb94cf9b6134cd2d30c8/pivatelifixofikedaxe.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b41733b6---59998563149.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/73447590998.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0f770cc8---59615443004.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e1c5a2f9d---40926453771.pdfIn PDF document text
    • http://thejosephinebryantfamily.com/clients/48776/File/99253197112.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081a5a9b8ba6---14828860427.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160dad9f19c85b---nisulolurupirew.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/veminizujalon.pdfIn PDF document text
    • https://tanthueviet.vn/img_data/files/25183150473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=calculating+internal+rate+of+return+manuallyPDF 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_off0000d55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD55A 16528 bytes
SHA-256: eac952f8e06138ff169d22a76f1b890a986781b48989404e3d59d3c388161a03
font_01_sfnt_off00010060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10060 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011877.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11877 10756 bytes
SHA-256: 036ac38aa4dcb7e688c66bf2b5562a5592856d6c0cb434aa78944169748b3690