Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a27e0d6e6ab37f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-16 15:28:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88ea7119ae632c1a93b7a099612f44c2 SHA-1: 108c4876f1582de10d167e686b75b9fb2f81d44f SHA-256: 27a27e0d6e6ab37f29e68d975d4210c0ed4771b8b2971aad89c1653a6e991860
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as link farms pointing to potentially compromised websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5347

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://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/74875441006.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qggivvimgi1qsogda7k62u8r74/50081959979.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/gozesilefokizesexina.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/19278142458.pdfIn PDF document text
    • http://sbairs.com/datas/files/nidowiwizagobegi.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/95617197539.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/13346770634.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/bodorufinavegam.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/58016267134.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/18730084177.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/35113300461.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/75612986860.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161331b1b8e4aa---vadugulolelawilax.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/44676540778.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/kegakopuzotukive.pdfIn PDF document text
    • http://nghieuphong.com/upload/files/ledegafakakekij.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eded825f18---98393613394.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/41449853055.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8746806e---43673262764.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/gijilebanimulebifabelelaw.pdfIn PDF document text
    • https://www.nitdgp.ac.in/uploads/userfiles/files/zajinilofafu.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/pezuvubupepumanok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=bundlerelease+react+nativePDF link annotation
    • 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_off0000ddf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF9 18872 bytes
SHA-256: 05c28f4f8add77ae2f66f7a19e9cae1d32c881bd4b51fb05aaae1f9128d2d0ec
font_01_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 10460 bytes
SHA-256: 8bec1191b615d08e03f50ae0847ad0b31ccd5aaeb0c67eb56b591b34fc259667
font_02_sfnt_off00012745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12745 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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