Malicious PDF — malware analysis report

Static analysis result for SHA-256 2348aef4455acf45…

MALICIOUS

PDF

84.0 KB Created: 2021-08-29 19:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 178584ef8211d609510a3cdc1a0800a8 SHA-1: 6c5a2c0449039bf4b5871b941b802b51cd526c59 SHA-256: 2348aef4455acf45b8caeb79a24d5f191d4d28d1ae30032b2f58c97dda17cf3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs suggest an attempt to obscure the final destination and potentially track user engagement.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3nbqtp6tu91boulebnd2v7bvg4/tedujaro.pdf In PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/76d31787212803f9119bdea0bbc8effd/doposizi.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/71081270072.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210617_E915553585EA0A08.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/moruxesob.pdfIn PDF document text
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/a6388d14cf1b6bddcfb9d17f8702f2b2/kesekavujuloxoxuro.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/30402873693.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160789a07a6b52---95873416795.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/xikiwerilas.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/25823731216.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/k8c5oh3tacqucihd2omrif75lq/wirabagenepuro.pdfIn PDF document text
    • http://mobilenmr.com/files/files/vupomexagorafoder.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099d8e510f86---25169231911.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/58195769783.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/362479052.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/923af29584ee119486628048bad5bd07/lefedajegidek.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/55528886384.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/c8dee6de897a624c453e2f5e4e6b6af0/66562933913.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/19333849395.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/65770859847.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/daxade.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160733f0bc5db3---tamag.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/jobopenes.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5a02a730---wegasi.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/f50c55919d4f50d26cebc861c35d3a7e/vozovatit.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/55667554054.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f094df2fa10---vefijafofedugoleruvojewu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hives+and+vomitingPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 17528 bytes
SHA-256: e02d85ff4155fbf5e1b558c098eee07113b7a1467381c4ee3549c0962bb11e4d
font_01_sfnt_off0001124e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A65 10504 bytes
SHA-256: 62498b5af16450c21409771282d790076a8505971db215439df34a0cf9cf6b05