Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36e262697394373…

MALICIOUS

PDF

70.3 KB Created: 2021-08-21 07:30:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7d43317d30948c94bca61f37c9e38d0 SHA-1: ba32d239bd7fab7e0f89221943a1eff68faf443a SHA-256: c36e2626973943732daeec908dfaa612d147ae2ae42d434e4539039bf268a24e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of an IP address literal in a URL further increases suspicion. The primary attack pattern involves luring users to download a secondary malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5876

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2a3c7705688cf72c37dfea33075a170/zoxumeze.pdf In PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086009a941a3---86715081143.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210814_070807.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/wimagemowugimab.pdfPDF link annotation
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8049d38ab8---mafezibanajewuwijupubela.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/vujakugejawukoxogesa.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dda307c560---nuxuvelow.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/58945328340.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c239272eefa---25275432924.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/00c303beb6dfd338869cffe2d846c465/xibufovobawapirewawerag.pdfIn PDF document text
    • http://cosyromania.com/media/file/45476126064.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/2ae1d85d9e9d642986e99a2984d75f46/zodoj.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/0g8sf4s8p91p1qgg9u977hncna/tafowabarabagigenafedagek.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/76688835863.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/wopurakegetekasej.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/tusifefamanexa.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/63909515381.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aac96b9a4ca---revelonakejakawapil.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/53537993874.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/6b2b117450e0e1de998ae9fed8d7d51a/49887771644.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071c44a0f357---rinit.pdfIn PDF document text
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/kcjjp4gi30erdvk5ovckn57g7t/gesopadeki.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/moraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=baixar+livro+administra%C3%A7%C3%A3o+estrat%C3%A9gica+e+vantagem+competitivaPDF 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_off0000e6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF10 11696 bytes
SHA-256: 1da9b1c78a65b2001560a20156e43583131193e12e98fd20fd808cdfad62ebcc