Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d9abd3b8675885…

MALICIOUS

PDF

73.4 KB Created: 2021-09-04 18:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 63414ded57bae929f90f3f6ac0b06327 SHA-1: 3e8504db4ef94d0ae0181a454e780f93a07ce952 SHA-256: c3d9abd3b867588594d48df7ec37f37c169cd1b3c626c23caf0dfe25a88540fe
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan distribution intent. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://svazekobciorlice.cz/userfiles/file/jiwobujikijewokolomalu.pdf In PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8812dca0e---mufibe.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce6895acd1---tutaserakilomet.pdfIn PDF document text
    • https://basisangka.com/contents//files/lirujekibe.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0a99e882---wiwowasidoxofezarux.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/joregubazufi.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/tudizijuvinirop.pdfIn PDF document text
    • https://norservis.com/files/files/vijagenitogepem.pdfIn PDF document text
    • https://havanic.com/cache/fck_files/file/63184841183.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/powezakixesajemifometi.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/zekigagomiduronum.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969381014c2---88898093662.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609626260d85e---6152621925.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/nukevabiwakalekase.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/6f2d26ed8c9861954361520da29cec22/kosab.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/0f2c47484065247244e19dc82dc024c9/91904136402.pdfIn PDF document text
    • http://fructusartis.com/i/File/13398662020.pdfIn PDF document text
    • http://shesob.com/file/files/gebom.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/98658000295.pdfIn PDF document text
    • http://skisun.it/userfiles/files/98030435117.pdfIn PDF document text
    • http://moristas.com/userfiles/files/balifexapedenemula.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/93665279793.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/42428417016.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9be2ea8156---31480515555.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/d2600a715e63b361e564db204e0807aa/24572435735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=othello+character+analysis+pdfPDF 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_off0000e2ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EF 16432 bytes
SHA-256: aa90ed39384ec5b96ec833da6a8703a3bcfc816f39b2ccf20486b855f2d8f3e0
font_01_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1