Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d20b809e2d9e74a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-09 04:10:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2a7938a95e1e0cae37ed953fd71b31d9 SHA-1: 127f0d28ef9b091939a0e575bb79aa99b1b1b52c SHA-256: 3d20b809e2d9e74a4090615015ec7fcc792509411d8e1cfc94df6704d3cdd8cc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS upload storage, likely to host malicious content or redirect users to phishing sites. The presence of external URIs and link farm characteristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://synerhu.ru/uplcv?utm_term=sparkle+violin+sheet+music PDF link annotation
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613364b77efc8---95572999694.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/gamida.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/2008a9d0a239723458fb97988c0a1aa6/jesidevix.pdfIn PDF document text
    • http://kahasat.cz/data/file/xenataroguzuza.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/hlf4klfku3ogb3slqtjqp4a9ot/lelibokipirikozobuk.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161392f805bb97---56385677042.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/36894966650.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/7053339450.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/59022776033.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613371ac7bae2---49209616134.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9b6566c1---bapumovole.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/vodalodal.pdfIn PDF document text
    • https://magatek.com/documents/file/11475717560.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/vafilugukurixatijenixe.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090995951_148584091.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/rixajakerug.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/ranesitopuxawifatid.pdfIn PDF document text
    • https://betsin.org/userfiles/files/vugilunibetemodezamese.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/1956878166.pdfIn PDF document text
    • http://marine-inox.com/i/File/63793024371.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365dae6da33---65174967376.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/17171509174.pdfIn PDF document text
    • https://resicolor.com/upload/files/6320896475.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_off0000d77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77D 17396 bytes
SHA-256: 00c7b469c78977c6bf4f6ef468325a77448218e7ec3f52b2d5672cba2c91ecbf
font_01_sfnt_off0001044f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10972 bytes
SHA-256: c9d333a97a8f146b4d867dcf99a2d5b95c88b261377e05451481167fa50679b9
font_02_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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