Malicious PDF — malware analysis report

Static analysis result for SHA-256 312e315488e11102…

MALICIOUS

PDF

84.6 KB Created: 2021-08-06 00:14:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 457968f7c513047dacb00ef486c3885d SHA-1: 6f42bb3dab2f8e34913eca97fc411c3075f898ab SHA-256: 312e315488e1110252fef377b7372d721e5b8a046a3ee971f8fadcf7af8dba69
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is likely intended to redirect users to malicious content, potentially downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9063

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://coretry.ru/uplcv?utm_term=certified+ethical+hacker+v9+study+guide+pdf PDF link annotation
    • http://cuatro-pr.org/sites/default/files/file/lexegavel.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d5ecce401---11596351860.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/6oafof58kl8kp40r9fv1aqhm45/fubuwufewaxe.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/nifulijudebogeno.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/i98ledomegs203nbgqj1ubcn3l/fevamamofunovuzuvupop.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160c3edde0ced2---18145607387.pdfPDF link annotation
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/pefox.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/rimagat.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/sopitomexigewu.pdfIn PDF document text
    • https://soft-print.pl/app/webroot/media/files/8809847330.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607051e060b39---17331879560.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608975f45bb5b---16569644972.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/30555280565.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946a8ec3f66---gitikowivez.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/wibuluvawipirejosadunax.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1helqoeebc07k37k4f0sas17am/futegiz.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb86ab03a11---siludofogagirezib.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092aa9c54aec---kupexafubajematepunulok.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/608f9c3c156003e58a7985d534ac758f/pozafopawivepezo.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/dijuranejizojujobarive.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fc9e0716f84---39195209893.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/wafiwudijavatafobaviboni.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EF 11244 bytes
SHA-256: d3900b6fbb37c8ecc8ec47405f04801e9863ad3a28262fe5842c364c86226044
font_01_sfnt_off00011152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11152 18564 bytes
SHA-256: 2468885f3a8fbc9814ca7be2bd23b070044648cfe5245f74d66a815adc3a4629