Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a69f4aa571cf98…

MALICIOUS

PDF

71.1 KB Created: 2021-09-24 16:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dd93e9f777e0345ce0d2b9dd23150205 SHA-1: 7087a02d8f9555fc7b61e4f12a24cbf402df4289 SHA-256: e4a69f4aa571cf98dedf5cf470bead108bcdc3dcc15c10151d40d009fd21f615
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, numerous external URLs were found, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=bubble+shooter+3+bubble+shooter PDF link annotation
    • https://adminico.nl/userfiles/file/luxunokufuj.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c54ee485b---wazixezoxilanuzow.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090315295677.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449959ebdbe---tifajog.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///pijipevotixasotosixa.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/16658872657.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/61364458347.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/96750730902.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/a1defbdf6e3b06333d688dbeb3b5a804/17308220408.pdfIn PDF document text
    • http://inistor.com/ufiles/files/99530674595.pdfIn PDF document text
    • https://intrastorg.com/userfiles/file/97713525365.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465239e3d14---92959468457.pdfIn PDF document text
    • https://duel.pl/userfiles/file/45526072078.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/veduvanasit.pdfIn PDF document text
    • http://www.dawnrotaryclub.tw/UserFiles/files/bunega.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/muvefoware.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/59608083626.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jisevikebugezupuxelimejoz.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/95754823311.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/20844013176.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/vibumapiwabokaguloled.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16144d7c633a14---27109497458.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/31676038322.pdfIn PDF document text
    • http://unibeauty.com.br/ckfinder/userfiles/files/xumovemerikadagotunagonoj.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_off0000b423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC35 16528 bytes
SHA-256: 57acc636a159a239d9b73b93926679cc7698aff6f244512aac3b40a9c6709560
font_02_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 10312 bytes
SHA-256: cce9c6fe7d113a5b4d8ec71444f6cfde87d8523d4d48366763a517dfc054dea4

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