Malicious PDF — malware analysis report

Static analysis result for SHA-256 91e5d2c67882f489…

MALICIOUS

PDF

83.5 KB Created: 2021-06-28 14:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1bb900f291f89c72290baf7a6c052233 SHA-1: 8dcf9749579977f08a2897dfded31c4620f0ab9f SHA-256: 91e5d2c67882f489b35f2a51c4ff96639e1df1e3f3b7f1f54f87a0f8517bd407
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also features numerous links pointing to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b5e813e230b4fe145dd4203f12366791/daruvobeg.pdf In PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/tja44bqdm2o3jkvlnv8vcb8mnl/95499682473.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/54274975368.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ue36gk5hu7sjff7o48e3ao02q7/70789900711.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/nuzurepadifar.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/newineruxevewe.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/59913592432.pdfIn PDF document text
    • http://nessium.net/userfiles/file/94074482830.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/549151050b7f1831603d3e55a0d05422/62422958182.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/26364273173.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/vusetex.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/suvesigawipoza.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/xalodufu.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc6febf1c---11794569913.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609197d4926c5---nikisuvukunetasijugavoda.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/16235485567119343437.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/epcukjp81il33qi9g6mhrubh9r/vulawewofis.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c03e5bd1f---sajosofixujazegafi.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8v9t5cvto46bkmuc0oi6phbdi6/27175268742.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/wogululogakizupakusoka.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/xoxijewebun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=counting+and+coloring+worksheetsPDF 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_off0000e171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 16972 bytes
SHA-256: dd103897bf348f287a058043824e987b6b2c5c1092ec2b6ac5d52c746304676a
font_01_sfnt_off00010de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE7 10956 bytes
SHA-256: c3ad273732f0c4f560b15df34c4210b65f89f7b58f5d8069c1f203a440379f7e
font_02_sfnt_off00012737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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