Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b1b98e2d235862…

MALICIOUS

PDF

102.6 KB Created: 2021-07-17 11:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9d591b930a84a3ef8e91d3475ee244d SHA-1: 723c4bd337b5e49440f460fa1a0e9098f52343b8 SHA-256: 24b1b98e2d235862d2277381b25de8a4ede2abc085adf5358d8347430f6653fb
124 Risk Score

Malware Insights

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

The PDF was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it is a link farm hosted on disposable domains, with multiple links pointing to compromised CMS uploads. The embedded URLs, while numerous, do not appear to contain executable content directly, but rather serve as redirection points, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2938

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 http://kasaitogo.com/uploads/files/radejelepaxopeporobofujo.pdf In PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/8nn1npdev0ji81iskgdp811mgf/29445756199.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ab419a309---labudusupiniwusakiw.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/zilofoze.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/ab0729a7ceefdaf1fdc1eda2efa459fb/vilumezotolenewosurupanu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee24a1e256---67400812487.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de61836b918---bijitotofakiluxagasow.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/5ku25s83vuijn6168sncudvois/7653531624.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/perelaru.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/333f930b9882d2d787f2c9e30e3a2a11/tonixo.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b10185ac932---4692792914.pdfIn PDF document text
    • http://kielcenoca.pl/files/file/bodokes.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/xuxokewemanasademezu.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/woxekomadazafebazugobesam.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/49740642712.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/42188180677.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/4934839561.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c0315fce---salamebumabasisirarulen.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/wuluvotidazuzozugiduzaf.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/guxep.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/linutuvipi.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/pizun.pdfIn PDF document text
    • http://miracleschoolministries.com/survey/userfiles/files/41059280922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=shapes+that+do+not+tessellatePDF link annotation
    • 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_off00014a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A09 19736 bytes
SHA-256: 6773b76fb40f87ed816963f6baf8861c9395d51116e76373ed0a48ca1348426c
font_01_sfnt_off00017d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1