Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b5cc35f52e7affe…

MALICIOUS

PDF

70.7 KB Created: 2021-09-08 04:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 41e380f14937a3059ef16ba67a83247e SHA-1: 60b6fcaa01bafadaad15d590dab81ddb4f1cfe11 SHA-256: 2b5cc35f52e7affe2050d16dba00e8a98612856b6e98f7fe3cd79852215464df
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to lure users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. While no scripts were directly extracted, the nature of the URLs suggests a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7423

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://wastran.ru/uplcv?utm_term=split+pdf+into+2+pages PDF link annotation
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c56770c29394a8fa5e94434eefee7742/bulujisobugufa.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/93856469760.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/zidikelu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a032720d698---43267763260.pdfIn PDF document text
    • https://synersys.fr/contenu/file/36206844816.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/27597576999.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/soxugofanazubasini.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c568cc3c---zigunebipekeboguzisu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073653678efe---jefoxuvojanitago.pdfIn PDF document text
    • https://ewt.cz/res/file/vikurig.pdfIn PDF document text
    • http://minipit.com/data/files/wesakofazigawiledap.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/venafunetarinaredenes.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/66326509442.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/afbioouaq21mbpthi2kn1qjmeb/nivog.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/40311560125.pdfIn PDF document text
    • https://twinslock.com/locktactyuma/userfiles/file/67311794154.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9j51htvoo5i5qrbanfehere287/20060483559.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/5c5f251d2b971b7339611ea9718b60dd/39246156057.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608362aede57e---96751729988.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb828a35a9---37806362262.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/mojep.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/famolutigotisajomofow.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/fd055d7337d4714d7f55ddbfac8423d8/selowol.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/ce03c46c358371a28b66848baf5877dc/45677576538.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/tafoxufifexo.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_off0000d80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80D 17560 bytes
SHA-256: c702c66a3339bb5f9fab976651a3b4efadd4a4990b0142f2e497d2c952d26d5b
font_01_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 10768 bytes
SHA-256: 627e71966c2c57aa08ab25a49d7eefc45ccadd564b7ca23fc0b8eb449fd20b39