Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ebd47ac95ea88d…

MALICIOUS

PDF

72.0 KB Created: 2021-08-12 07:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11945fb8be012141f26172906b959ea6 SHA-1: 4eba535380135ebc6a96e68b06c4b827ef244d4b SHA-256: 94ebd47ac95ea88dabf0d458bb162110ad6a557e27ada613684e3f050efad105
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary function appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5338

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://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/fac6u7lkfo1ulojmmddbmtfehs/68944769702.pdf In PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f58ee0cbb5---neken.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/51954406453.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/18595444913.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/151b887a73f02ddf730b8de22eac5c9a/29367040937.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa6d6df3c---fawigip.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210608_005319.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/panakibilazude.pdfIn PDF document text
    • http://naviway.su/upload/files/mudezemalima.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/20839784278.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/69771f1023c54277091f877eb40b02db/nusopimi.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/97583402995.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/nawexubulakeposafivomu.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/38611359336.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e0df03103b33ef29adc2348dda63a09/jajuvesozujom.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/tezunuxorivazeja.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/15/file/20210515_215810_103.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078cfc9969b6---86336255798.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160be8a74280b5---vuxeragewiji.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vm8vvnml72em0sj1p7qgt1rv6b/debalimo.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/58243944760.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/zafiv.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/3464f2d5fe8327299fb13fd48851d646/18326928576.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/luwis.pdfIn PDF document text
    • https://hgb.se/filer/file/34732281615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=candidate+elimination+algorithm+example+pptPDF 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_off0000d66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 10804 bytes
SHA-256: 3ed734c21095bc1d1b9699d72f3c2bd0b6fbb237d71c6bb449bf82a93026cb4c