Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6e1fc9eebeaf29…

MALICIOUS

PDF

46.5 KB Created: 2021-07-09 09:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: f6bfcab2b0af1ea1484aa4edf99b5e22 SHA-1: 06824e52fbad5babc0a8b205f5ebe975c0ee41ff SHA-256: 4c6e1fc9eebeaf29082ef289be77076f46255597aff320d56f21c0a2203ec537
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' points to malicious content hosted on compromised WordPress sites. The primary URL, 'https://infrive.ru/uplcv?utm_term=lecture+notes+ophthalmology+12th+edition+pdf', is designed to lure victims with a seemingly relevant search term.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6520

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://infrive.ru/uplcv?utm_term=lecture+notes+ophthalmology+12th+edition+pdf PDF link annotation
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eca4955425---28917584373.pdfIn PDF document text
    • http://modelseafarm.com/kweb/ckfinder/userfiles/files/funiwugijorewosaba.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/31322707155.pdfIn PDF document text
    • https://eternalbliss.net/file/jediverapitukenenibaru.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1jmt33ks4uovrqb9jgvpve4obi/kuvopatomiligupade.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/73914882828.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0bd197a86---lovutiberinapupe.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/gipitifubudulat.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/xabozupekitum.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/p2fotu5cuj1q4ak6tv67mhq3i7/sexogizun.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210627_6165F01E6D32399E.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/97085a62bb94a89d8a1a22c5bf7bedcd/79381719612.pdfIn PDF document text
    • https://tavio.ru/files/file/miluwibosilisajifobojofoj.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/bjpqrl44d7eg0tib7j575n3j0v/wevefaguronemu.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/migibulata.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2866d4ea0---zaguvavizutikimak.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/e1ea2f0096233db84e901a3d2a352757/82818761167.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/d27b23386b331043093fe44755e1e742/wususox.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c396b00f80---71151081878.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/9612631983.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021060209075873499.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0ed9ea129---54256213463.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lejujirepi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609481afcfa6b---15624748062.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/e27fd767f4ba600581166cd126342e98/83931153750.pdfIn PDF document text

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