Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a000742b132ff21…

MALICIOUS

PDF

83.7 KB Created: 2021-10-13 21:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3977850bf5754d1e53bcb6deb635d14f SHA-1: 81bb9f7c89e02a46923f3743b4b8ed75e489bc0a SHA-256: 9a000742b132ff21e7f7274bcfd73246d94de4331bfcd8a14bca76667fae2127
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be a link farm, likely for SEO manipulation or to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/8fd5e833bfa4ca81c828ec2553099f52/jizogomulipikugofe.pdf In PDF document text
    • http://alburigiott.it/userfiles/files/mazunofi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c9329d646---84578179890.pdfIn PDF document text
    • http://bbmpva.nl/fckassets/file/30312571162.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614d53e9723f5---vazobubotodujupok.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9bc09bfb6---jegab.pdfIn PDF document text
    • http://lagrupacio.cat/file/lapalosunaliditaleg.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210906/2253306578.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/74979652271.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/bfcc16008302f1f4dc2ce92a5328c7de/ridipadefiruravapinujem.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/pukovegufakaxajekuvor.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/wubepupe.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/rovigurobat.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/e6n3midlgbcagqo69klr1qcvsq/miwevizopixewafex.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905172414.pdfIn PDF document text
    • http://infoguard.ru/content/file/woduvidanoxebin.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/linefizenosolujupare.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/77092891387.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/zilafalufawakokiwibef.pdfIn PDF document text
    • http://hingliltd.com/userfiles/88245280446.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/f5ca7305023d64f4e4e91fd237d37296/84618862084.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/oa04iiell1u4gla0jq4tkaib95/tomudusokuketewewojepane.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/23929396178.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/27542008669.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/65993505383.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/vItLtdF7Pec/uplcv?utm_term=if+a+firm+faces+a+perfectly+elastic+demand+curve+for+its+product+thenPDF 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_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 18656 bytes
SHA-256: 2ea5a56fc8b11dc111f2adc484ce0fd79fd9ca7043f689f4ffdfe0ae698af7b2
font_01_sfnt_off00010eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E1 11116 bytes
SHA-256: 535863e74cdae4bfdb13ef9445739e57840000d61561d22aaf032db564a742ff