Malicious PDF — malware analysis report

Static analysis result for SHA-256 85764f45bc256f35…

MALICIOUS

PDF

62.4 KB Created: 2021-07-28 01:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 21023e395c0ea78551fb407bb771024a SHA-1: ba93fc02607d70df2dbdef496af3d997315fa309 SHA-256: 85764f45bc256f35139bf5a24a4d40fd345fcb632b9aed91fd8c53bd61e8c873
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised websites, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection further support its malicious nature. The primary purpose appears to be redirecting users to potentially malicious content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9344

Heuristics 5

  • 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.
  • 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://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/10295809243b54f94ffb317f482fb224/29999637245.pdf In PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/dawotuwurupugegipe.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf54ed15a4d---pufuvivubado.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088608b2965c---setagozaselezavotuvenu.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/xawodepapunabelumewegafel.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf7049a6bc2---89960107358.pdfIn PDF document text
    • http://kotolantopeni.cz/file/nudokilux.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/3c62fca5ee6ab65b1d1cb6374dbd3ec2/jerewovowuromi.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/34685b8c614d30b41efad0309e7a310a/tomegimevuwen.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d39576245---kamadatezogapibewinew.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pokavoxode.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/9e6419c1c48c4042df02de0ef1eb2e93/wakalalelatijasigo.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/1767705efccaa429491b8b423a1a8d0b/xader.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d631f3c3---35974904912.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/piwej.pdfIn PDF document text
    • http://brlairport.com/images/file/kugawafozubukeren.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a52fda1accc---57424900182.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1f77261f3---fulaluwogejinamimixejo.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/93a0kn09bml4dh8ajosj14cu0t/63149747948.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/12880132313.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/kobapim.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/87d49d65acb5ffa92382f1d10e2edc8a/11092943402.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a071a04d063---sonepibivegavatokun.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/lawilivimidepezege.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e6979882d---pupolunusarokivuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=evaluation+6eme+maths+le+cerclePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3BF 16404 bytes
SHA-256: c4b86c2c67929994c06a3ade7c14e024fa5bf280ca372011153da674e1fc50a2