Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6746d8e4b21933b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-05 08:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66a7000ad03537045f88f92b0018e7e4 SHA-1: f79aaa0f607f687fc6d9081f7a07b217c4de2cef SHA-256: c6746d8e4b21933b9a9051f80af1cae48c10c8fa77b0f5464a7f905caedd3fe1
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=physics+textbooks+high+school+pdf PDF link annotation
    • http://ptichile.cl/userfiles/file/13994174282.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jd24s73qgnp3r68bhcnqltp521/razapakolekodozu.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/32887912540.pdfIn PDF document text
    • https://masihpt1.com/contents/files/tiwufowukusukorolekas.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/31d8e24ec9d54577d902be469baec364/besofu.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/seweginimijojawiziseb.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/09aee265eb7e452c21eb8c41a920eeb6/94178655773.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/bugoluwelibiz.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/85479010164.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/e22b12c46ce81457b207a7964ee4638f/71482126202.pdfIn PDF document text
    • https://la-klamm.org/Files/files/76663494676.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b34ee699---82274866999.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608445ce9d5bd---xabimo.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c47e843d56a---97455710707.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210608175728_9rgg4p.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/a158795365a2bbfdd9ce0678dcd60d4e/zinuxumelafukerijukaj.pdfIn PDF document text
    • https://vinniescustoms.com/userfiles/files/23788689792.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/80998338208.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/dbd8e6325b84bcdd42af25b3e8d84586/67892673044.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lepegemusita.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd57ce61c3---ridek.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b59a2cac6---rapivitoguzupigagigimide.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16110028db16a6---54273294531.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/vikadenudopubomemologaba.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/navowasunoweruma.pdfIn PDF document text
    • 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_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82A 18176 bytes
SHA-256: a16d9246e08d29f82dd8033371b278a2825cecaa5b3b55b53f7bcacddb6136e1
font_02_sfnt_off00011735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11735 10980 bytes
SHA-256: 96fd71e6441d9f829bbd8d94deb2b1e1361e41856d7ee97ba8ac34918710dbce

Open this report in the interactive analyzer, or submit your own file for analysis.