Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd3eae57f4195eb…

MALICIOUS

PDF

77.6 KB Created: 2021-09-03 21:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acb280a78ecd70c45c4086e2e9e90675 SHA-1: c3494d9f20b9e14305528df4d7df7ddc1e5dd976 SHA-256: cbd3eae57f4195eb152531e65239ab8aa88b67638857053e729cf3dfe8866558
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicative of a link farm designed to redirect users to malicious content. ClamAV detected this file as a phishing trojan, further supporting its malicious intent. The embedded URLs and the heuristic firings strongly suggest this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://karapinler.com/calisma2/files/uploads/melixivuzuzenugojeb.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c955f70343---59245869723.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/c6144c06aed87e76e28f95d40ea4157e/zixesibinedodoreravajup.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/36902357374.pdfIn PDF document text
    • http://imbirimbir.ru/files/62214127051.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3fa57d565c341fe639d84c329d84a462/vubowirukamekurox.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/a85903c2ed337245d75b52e7f0093af9/poritok.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/43871766795.pdfIn PDF document text
    • https://bnovum.hu/downloads/93802578841.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0364cce8e---50895440667.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/pisifipemokete.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad2c501ba---82304974142.pdfIn PDF document text
    • http://rurisnet.org/images/file/gokusuwavadabizaxabezu.pdfIn PDF document text
    • https://energooptima.hu/upload/File/81097856855.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d0a9b8c77d0---fuvupabomadulikifij.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ae1520656---48037753417.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/webikubi.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/57434479742.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/781182c1abf5a03f633681abd9ca5823/2468789379.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8a5319d593d28961eee1606108a7db5b/gijanalujosapo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/nu5oo1bp4ggv3t1jt8js9a9vbs/dibixatafogakabo.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/36615680737.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/92215904810.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/tuxagemegebobofevuzavali.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-6-29/20210629121724600642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=forty+rabbana+duas+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_off0000f75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F72 10552 bytes
SHA-256: f6b6f7d721d5e959dac785c95f6036d1248d2531e8c89ae1ab6e960134bd776c