Malicious PDF — malware analysis report

Static analysis result for SHA-256 55662af6fdf7fe71…

MALICIOUS

PDF

91.5 KB Created: 2021-09-04 04:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 35758d49c7fd0d37c4eec85cf2b2b2f9 SHA-1: 96e710340dd8ffca797a42b7073aae7f8bb12465 SHA-256: 55662af6fdf7fe71d4e9d765abb478e42edfcebc647f80a97d28dfcefe8c3a4e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Several heuristics indicate that the PDF is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6564

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.
  • 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 https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/802ec583274a9da09dfe822690cb4ea3/10150444802.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de846cee796---67952162532.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/36046495026.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2942091cc0---lafiroraganexojom.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/gabunadomisu.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/10586694489.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/xisifixur.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/89789373077.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/39819505986.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/85910107302.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/m96m5u661r9dg42kbb0rsgf95j/jomevaluwosejibuzu.pdfIn PDF document text
    • https://encoregallery.us/wp-content/plugins/super-forms/uploads/php/files/f388bd69cf97d64e488c8031f0670d05/rabajusubefibidezakolafu.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/mobifepaxemibizit.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/30672505696.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d79bf43b66f---51193065655.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5f69da07---21492282217.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/1890888413.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/79710788.pdfIn PDF document text
    • https://506hlapeta.com/files/file/96798774484.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/052v55mb5lbsp7ntakbht6vp7l/45032353309.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075475ae8e3a---23402500135.pdfIn PDF document text
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/jomosipawulufifigowoxasep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=vernacular+architecture+definition+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_off00012328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12328 19844 bytes
SHA-256: ecbc84daa08fb20fe09067358ba54e0be415926ab65de402d98bb32d516d77e3
font_01_sfnt_off0001575a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.