Malicious PDF — malware analysis report

Static analysis result for SHA-256 b711091b50135f51…

MALICIOUS

PDF

76.2 KB Created: 2021-09-25 00:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9b6327b6aa9d4dc5c54a5534ce79038a SHA-1: 90f63bc32e0180f7b93185f4b5349f5210f7dab3 SHA-256: b711091b50135f51e6b565ae28e12b5c4743f0b9d0af3ccf2128a6e79fbc6649
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148018d0cb4b---javusajizituvadamatu.pdf In PDF document text
    • https://kopari.hu/files/file/60602460122.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/98954800748.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/fuliximozewas.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/84002933799.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/sidagovedoxutupupu.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/55841655073.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/jetibozukexakukun.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161394b3c07420---jetumezozuv.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/u9qt6k2l0a11cs4ktvcv34cksm/38556565038.pdfIn PDF document text
    • https://redac.ch/upload/dunerutode.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/93050025195.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///bavinupudenat.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/422dd50d155ac22f38cf2fd268078c12/80154761975.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/47877943840.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/29387884574.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/44369225527.pdfIn PDF document text
    • http://gardensyellowcab.com/admin/images/file/83191558357.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/62510263611.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/pewimeduke.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/68685857747.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/6747728237.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+action+movies+2021+full+movie+englishPDF 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_off0000c038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC038 11196 bytes
SHA-256: 9e06bf2122066be7dfc3525a4c21d396d669c1d58fde77909c6a4204cc0953ee
font_01_sfnt_off0000da6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 18672 bytes
SHA-256: 87001b4cba75b14593c83e98d9e9dadfd0ce094f5276d53adad0a9ecd1f8fb59

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