Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed3783f503ca1b4…

MALICIOUS

PDF

82.2 KB Created: 2021-09-17 22:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcc25ee37a11b6627706cb986081a536 SHA-1: 4673fd741a4bf978123d25b58132549562558482 SHA-256: 3ed3783f503ca1b4ae0c815f062ced177726a8f23baaf3cca99ccafbd7f3a481
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://fuguchair.com/upfolder/e/files/20210914091531.pdf In PDF document text
    • http://crmrealty360degree.in/userfiles/file/nezuzaregerinetu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210907152923.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/59186029958.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/nikudutagopegitifemowakif.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/rilija.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/dekomedirukiwuj.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/9813059274.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/82717706058.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/40199856758.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/bijozidumujosar.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/larijegiwisurilaku.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161446db79046d---90907980632.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/90430441363.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/17378476808.pdfIn PDF document text
    • http://hak-al.com/resimler/files/penufodexalo.pdfIn PDF document text
    • https://photojet.net/userfiles/file/tariw.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/rizifinonedamalekodojo.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7651dd03---63058609857.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/wedumisifo.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/67031017917.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614131399abdd---95890334218.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/wajutiroditujurarib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=harry+potter+philosopher%27s+stone+epubPDF 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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 18696 bytes
SHA-256: 4eea3552f536e33f60e4ff2a3bda1b03c161f243ad6d8cd7bcf59e12f72b776c
font_01_sfnt_off00010a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1F 10728 bytes
SHA-256: 6561751a49b513d324d0aeca9cf2aa2f16255ad2a8133b0dbf6eb2c18ef52153
font_02_sfnt_off00012285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12285 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1