Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbf9da7c2db9fd57…

MALICIOUS

PDF

115.2 KB Created: 2021-07-06 04:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ec0c592805f507594e11529a3a11f3f SHA-1: f7168ea9b71191f16b0c5f9dfc9bc0610c1a2d83 SHA-256: bbf9da7c2db9fd5730f5ef8f05ab3096e63a46847e76ea59b96995f074990b02
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and disposable hosting domains, likely to distribute further malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obscure the true destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6077

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 http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e8dff77c890e55e8ce1df530eeff9677/71931110730.pdf In PDF document text
    • http://allmedicus.com/userfiles/file/bewuku.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58288a124c---pixatisosarolukun.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a09d2b3859---95386509204.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/tikegodonukijesawevasa.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0676de7b3---53303478723.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/2lurk0ladl1g6siauchv127j15/venobudebi.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c58ccbe1128---4842587502.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/776624763b7daf65e8d9ea299e30a311/56276831909.pdfIn PDF document text
    • http://polletnv.be/uploads/files/5730494215.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/i83vpmd4cunj8toig8v4fq9i57/wozilusatobepidinota.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155f6b022e---64548013935.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/11643406956.pdfIn PDF document text
    • https://dptech.vn/uploads/files/rejezajis.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/b400660fa2077ea09928e0868da1e84a/zaxabakiwasixosawosawaba.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/15252639866.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/0dlhvnf8f8bm9v9l2jqdftu7ms/mexezanarizulum.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb5d36f8d---zilonike.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/66306476306.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/74376681259.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/82076781150.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/vikiziterawisiwidavab.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e44df7a819---mokaded.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=the+counter+revolution+of+1776PDF 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_off0001a36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A36D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1