Malicious PDF — malware analysis report

Static analysis result for SHA-256 a256cd052cbaaeba…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 14:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6c6e4e2b00e7f33093debe906867a7ea SHA-1: b90126b1a7542182a925a9d4dcc255337a665342 SHA-256: a256cd052cbaaeba852f6e7c74cd4d25c2e42e7d853f0948004f4508fcd0124d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/77ecaded8c548b5e0af93ad0c3ebab47/jozafufolem.pdf In PDF document text
    • https://ferropula.hr/files/poromugiwarebuxikolevole.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c7f196634---sukidokazowevatif.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/62897720574.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/mi0hue1gg1opf0dt0lq0o52b26/visovepofo.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/cef2527d73726d027443ee3a76b7aaaf/49803090517.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210620063528_1983673938.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210613193650305632x643ek.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/3e16c97913d4c7ea6319c52dafae57c6/mukivepipepozolevotos.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/rajogonuginuji.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/4eff36145ce9eb61e5f9d648ab9b8550/mudolovesafiko.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/47144415737.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713e68f189c---pimemafatuluxiwutel.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/0e08bd18ec3f3e3b12990c9858cb48c5/93277945373.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/8cdfd21140c384c0709b1b926de1c65f/1156036887.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/66274588884.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/fuputopezuxafifizamuvep.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b7b441bbcec36998658341130c581484/fokiferesobi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc30e8bf80---vamanovudegat.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfafadbc42a---13095138628.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/4ec7005d0cb9b894b6c0622f3d2403cf/58208473505.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/52358603890.pdfIn PDF document text
    • https://kawanmto.net/contents//files/kezowuzajogokimaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=evs+project+on+ozone+layer+depletion+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_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 16664 bytes
SHA-256: 657fa66c7fc0fe14b23d1c3a3ed6bb3edae34d5a3a49c508fc5d16cf9fc2ed30
font_01_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13720 10968 bytes
SHA-256: 464579a547edab0ac1bc395cc07af14e76c950281a69732376e0d6d9a333c053

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