Malicious PDF — malware analysis report

Static analysis result for SHA-256 0888e69fc6174443…

MALICIOUS

PDF

67.9 KB Created: 2021-06-17 23:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 96c26e89709b1a6ccf9a1004eb951e68 SHA-1: 809be72067a3e58af811ceddcb2d8e0a598e98bc SHA-256: 0888e69fc617444383e358257c661862cc8bbfca4a104ec6b46618d6d052c88e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'science and technology vocabulary exercises' to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9736

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://coretry.ru/uplcv?utm_term=science+and+technology+vocabulary+exercises PDF link annotation
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a391cf1a977---puredetefevexakusevov.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb023b6277---38667814801.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/nilowelogixoragiv.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/92258379635.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jarowinodanigekolo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/41753692138.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/pbu972qj3k0hpg1srn3svhuco7/48749452902.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/r3cbdh789sa5f28bofdvam8hm2/76796552832.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160874de2a297f---rakajujivuzokipofezelefof.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/d5dbe61ba320c1586cdeacfebedd57a0/57773361677.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/mosoxanefuditubovuxefe.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0d43d8b5a---40773693564.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160900e218d018---58282882128.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/iei0iprgsd1vg2dsq8eeei65e7/40862157213.pdfIn PDF document text
    • https://mmszke.hu/files/file/5838751340.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90C 5676 bytes
SHA-256: 8c64f2075a2718a7260a25cfce98e63f83f61c85497b0764fc7903c99626fa75

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