Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a65db2ccbbe7e06…

MALICIOUS

PDF

81.8 KB Created: 2021-06-26 11:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 73e168b41e456a525d40d1cdb18360dd SHA-1: 988c29fb874c665e6110423cbcf4e38131fb60a0 SHA-256: 6a65db2ccbbe7e06b1685d3cc8de880bbf85d087882236b31b17624213d64607
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. No scripts were extracted, but the presence of multiple external URIs indicates a likely attempt to lead the user to a second-stage malicious resource.

Machine Learning

  • Nyx PDF Classifier clean score 0.2133

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://medvor.ru/uplcv?utm_term=us+non+resident+tax+rates PDF link annotation
    • http://bienbao.org/uploads/files/temevamofos.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/ef9b2206813d549846e6d53eeae84f62/88051466587.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e9e3c218d---88560862475.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/wuposad.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/kepesetakisapozugexojite.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/klbhrbjaicrm3dh6gd1sbi8mv9/kosexakazabo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e029de7ff531ee455ece84c25567ed96/mibusuzisolizomezuvose.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16071621aa2e3e---tiludedabi.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/1rfvvqkqdolirhf9hdfvqne69d/5873726830.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/19543870394.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/2534211678.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/58138437394.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/3eb51453d7a0035a1adc5518d6dde437/xopuju.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c40d68d0d57fdc98dc2fd2461e436f8/53074157594.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c4b771c71fead29edffba7bf963e6a67/losurivawiguker.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/gqb0s4r535fgnj1pp2k7sjuea5/2280776660.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b8dc940ea8e8cd065772610125037644/73135175079.pdfIn PDF document text
    • http://allycatering.com/userfiles/gilonemabawixi.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd01f17c42---disazeserasiw.pdfIn PDF document text
    • http://hzdshg.com/images/upload/File/riroforozametaladipawet.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/xuparidulunodideseto.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609786353fb26---fonedorezobezedub.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/djn2cr8j2n9ld4iftp06fh64a0/ponepelomixo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a50b6cb3d82---lafiwuwozaxok.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001022c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022C 16996 bytes
SHA-256: cbba335e7e80d90d87036d3aa8019f09f839000a566d16209fe99b19730c6b73
font_02_sfnt_off00012e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 10304 bytes
SHA-256: 8ad5e0bc1adf4ec3f6b0912d951bf5f403f14ff2254f06b58a590d369161ad15

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