Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fbff45d25e86b5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 21:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 46ca1d59bba0e4f55d934973979e040d SHA-1: a8b915ce5434e25e2ecdeabc67d03ef6280350ff SHA-256: 27fbff45d25e86b5cb4724e843328e702e63274b41aca59da4b2e97da2a6fe73
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs indicate it is likely used as a lure to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6056

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://allytemp.ru/uplcv?utm_term=pathologies+de+la+grossesse+pdf PDF link annotation
    • http://nuraski.pl/wsg/userfiles/nuderugo.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160766dbcebd2b---44730862311.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/cadb61fdf832193e2ac1ba48f10c7eca/nutani.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/m1tr6g6hgs69phim69km6gl770/dalusanogedegegoweko.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/eo0mcofvjlqliqothrpo2n1h4o/58071737913.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2d16fd53adbe8cf81b79a038708547b8/topugibozujixepidunozagaj.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/913bc4c8a200dbc65d4b0858562808f1/folizubifawajun.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b742b4a3f3---wakep.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/8fafa7b1a47fae54e0d465bc85dcf09e/43010650895.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9b3a74b0c---73345322710.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/71555776173.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/71411909479.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-8-31/20210831093039764064.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/vufimomik.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0ff711b454d25b681bbe3ca5ba9e04da/6932896867.pdfIn PDF document text
    • http://lurome7071.com/clients/e/ec/ec9741bbacd2a64db66b94b03f3cd24d/File/lirotibikaw.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075a1a40ecc8---rebupuvebuvurijepipi.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/lavapokepabi.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/69441043656.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe35515221---9330166110.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/33394762053.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085e96e79ddf---34349888116.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/radaduduziguxodenixumux.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/65632580563.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/jipetuxonixi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1