Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0b4c8a795c8ffdc…

MALICIOUS

PDF

68.7 KB Created: 2021-06-28 16:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d58aa9251f122b5ab68d86320f96d4b3 SHA-1: bc4a0c22bc4d75cde7c3d263a3922ece9f83dfc9 SHA-256: d0b4c8a795c8ffdc6d5b54fc8e169b54703aeabf321960ab165387ef838858bf
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting it functions as a link farm to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7252

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://n-v-v.dk/userfiles/file/menasuki.pdf In PDF document text
    • http://vladjurnalist.ru/archive/file/nonetemizivezurel.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/dasj3vcgu5tshbpuppmkt2co7l/fajexu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/23792242466.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/15234057372.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0f441446c---66242751637.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d7d65a7a---vufavugareturezufelesojiw.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da3669c79d---91002736164.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079c9321910f---20751539812.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/bozifi.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ro7q28q10pjp78nmb1f1hc30g7/nomepogaduvoju.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/0bd9f3197d9590ccc07074fe873977db/35977424171.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccf7de4facbf9ee6b5f64b6dc00119aa/liratemelusoje.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a619e99fff1---vanevi.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47b5465360---muxado.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f348e6dad3---12897216035.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/qoerhmhv0cjmttg8qipafkqtuo/merololuxitixililumopar.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/wowifusisirututaba.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce85bee1bc---44600619322.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/13a7b5f4620630ac7548726dd9042d8b/83390652541.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b2bc9c0d1---fuvawubupipogekuzesa.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/fupulugegit.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-7/20210507023119705653.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/rutoluki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=english+name+for+boy+start+with+lPDF 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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 17244 bytes
SHA-256: 80fcae17fd67a065387e56f2602bbd1030b10f9c87639c0d5d0a8b9dee5b3adb