Malicious PDF — malware analysis report

Static analysis result for SHA-256 51304ae78bef0ab2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-10 14:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0935c9972e4a82383d5a5184db64f14a SHA-1: 27194340153d74e7ecc2e07e2a8199726f4fc3e5 SHA-256: 51304ae78bef0ab225c14e58eb3690071bc568f22acc026db280ac3498b0e197
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The embedded JavaScript and the nature of the URLs suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=how+to+import+text+messages+to+new+phone PDF link annotation
    • http://www.cavice.fi/tiedostot/files/592117539.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/najavakakesuwasuwoki.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/figewodixigunijot.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/dirov.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139ee19419ab---gepakazugitut.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/sezufim.pdfIn PDF document text
    • https://kokomanis.com/contents/files/siduxakitemekada.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/kibumewunimidorivudunuzu.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/88430823858.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7272599d---bogabedeviwate.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/80432954748.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/pafuxa.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/kipuzo.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/20412289859.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/dewiraronokuvuf.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/basebubalusafopum.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eecb238054---vamaduxor.pdfIn PDF document text
    • http://sartor.ru/upload/files/suzijonubimiximo.pdfIn PDF document text
    • http://mcdanielz.eu/files/file/legasexelojedijowuvinajo.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/vipepulemum.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393fb53848e---larixutojuberaxolipupe.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/59954204621.pdfIn PDF document text
    • 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_off0000e321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE321 18028 bytes
SHA-256: 205a3cc7942fe532830ad3985e8952d4f70817ee926b27db9fda07165a4f576d
font_01_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C0 10832 bytes
SHA-256: 61232a9a71b4ff0e6a631aba1c1dc20ac1b99ecb0dc310d4c04f468d65aa6ebc

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