Malicious PDF — malware analysis report

Static analysis result for SHA-256 4863f8eafc45fe84…

MALICIOUS

PDF

85.9 KB Created: 2021-07-24 06:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4b9e99a210109eac70fdb49bff215c59 SHA-1: 1093006e0c144a27872c9de337678c2b9a96cf68 SHA-256: 4863f8eafc45fe84604803584003682ef51cbd5fe7963d0a3353de2941935b7a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5019

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://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c11cb3e1b---nudixujokemomerat.pdf In PDF document text
    • https://brod-plovdiv.com/images/26938928228.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d240580d7---buvefuwamuvevujewubago.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070916485480554.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec424b4b80c---xinezak.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/dotepegisunoziguxis.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/565f0d86efa0487a21718928ee6e09bc/funajonoxagumukefiwalazu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/hg2g8k45pskv1amko9dpla2ld6/1036257094.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/ruwolakibanovobolu.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea4b67e11---womozizof.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/399214977.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/28687327212.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/48835923555.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/80382480383.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/pugitajigubadijefam.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7f261bc2---24081821423.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1821f8ca---xavetisatajexil.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685f28c74b---89993920234.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/wifiwoxazalasa.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/d9b6286cc09058a6877fc1625fb70e41/13677710990.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085441c709c9---vezesap.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcde05d594---29364249124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+does+it+means+keep+a+promisePDF 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_off00010a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A34 17328 bytes
SHA-256: e052f1a734781353ac2e45f86d722aeda252fcf9cfe525a96ad528cd760ab90e
font_01_sfnt_off000137aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AA 10696 bytes
SHA-256: 0925d27667334606adfc66e05b1b2f8fbf5d6f5b2d1cf27d68bdb52d0dd33d9c

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