Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b476ecb379ddc60…

MALICIOUS

PDF

118.0 KB Created: 2021-09-18 21:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eaf3b3153aa6472d9745a571139f7734 SHA-1: 2bacc2f0510a79c17a651892a9cb5e515678ec7f SHA-256: 3b476ecb379ddc607b2f99602177e06d96e4af6b1f4df66ab93f0cfdd0d47ddf
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate it is part of a link farm hosted on compromised WordPress uploads, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7791b91d9---77331901856.pdf In PDF document text
    • http://cheers-gifts.com/userfiles/98251162415.pdfIn PDF document text
    • https://finliz.lt/i/File/19380780183.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/fugigekolutoxejejoso.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/92918435373.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210914091039.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/55kh5rr89a13tdjvsehq83nl9u/lunopiwobexim.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210913022054802170fi8nfs.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/86682484492.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/69971821419.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/8095118350.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/fejatonek.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/sepexe.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/fipolix.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/11249552059.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/jawirej.pdfIn PDF document text
    • https://zhansq.cn/upload/file/gepukazafa.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ebc092c83f843e2a7e160716d31126d/53860953865.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1fc26b986---11373532575.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/kasexaridawudujudikudivew.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/ragiman.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/bikaxedopotelifivad.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/gusajifipazenopojipesuluv.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/26296476850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=advanced+reading+passages+pdfPDF 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_off00016644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16644 10576 bytes
SHA-256: f2dd0a97af15a65b1dd9d582ca3c2894ed31553e5db72757980764e40bdb395f
font_01_sfnt_off00017e53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19665 19900 bytes
SHA-256: e12fb935fc51d2d49356c826b8e9892439a65f25a093c2bcd22c9911358888ac

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