Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3679bac8377eb8b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-25 17:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a411ae0ee5094ca3159547f7b1d69e43 SHA-1: f284a223338e16b3fb31efc81da7d49f09bc9785 SHA-256: e3679bac8377eb8b457916158097d89af5d218146a31a9959e4e17342cbc7e07
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. These links form a link farm designed to redirect users to malicious PDF files, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132df3a145b2---39989304977.pdf In PDF document text
    • http://katachizu.com/img/news/files/donawokewuwutojaj.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219211134291991.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f2ae2d2788---75281226577.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/32545738538.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/worepem.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/ligupanudagavede.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614b629006b1d---34461797731.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16149f6da4a71f---vutaxezesabem.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/nixikolavalavunepafudosu.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/mezinokalololenegipagixeb.pdfIn PDF document text
    • http://esejsc.com/upload/files/dawuzinapizes.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/0875f1988b9c8e6355187a19ca024715/36253598663.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/powomikikaluva.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/buvomar.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/161388b3505e95---sexavode.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/purokakugedilexe.pdfIn PDF document text
    • https://breedlife.com/upload/files/68256568408.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/toviju.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/84960050389.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/47a7c159f86d74fe148df13932df2dbb/97537658739.pdfIn PDF document text
    • http://vhz.cz/user-files/84627203252.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/bozivebumof.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614acead567e6---podetojo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5e42db737---dosoxabosilonipopow.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/vujadutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=double+dhamaal+2007+full+movie+hd+1080p+downloadPDF 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_off0000b4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C7 11340 bytes
SHA-256: 9f46022939690b4fd2cbcddbd092832ce3535ef17932d4698db897cda274808a
font_01_sfnt_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE743 17588 bytes
SHA-256: 90b3e5b8178e2da08f1ce337493a816496cbc03f95ebae32d6bb09731413f409