Malicious PDF — malware analysis report

Static analysis result for SHA-256 4455402b7befb87e…

MALICIOUS

PDF

77.3 KB Created: 2021-08-12 14:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-12
MD5: 0c06a58f9812496009877463e492599e SHA-1: d78d810f5cde70781330fdddc5b977951e0e80e9 SHA-256: 4455402b7befb87e466c039346b902f18297fa42ff70dd29dbfae91929fd5f2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://sochi-vitrazhi.ru/ckfinder/userfiles/files/93554943019.pdf In PDF document text
    • https://ph2020.org/FCKeditor/file/95959957928.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/78079935758.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/60485243248.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/xawemupuvumawisigowos.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/24905390393.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b01cb35d75731841cf06e5c151f52023/vuzusibesogen.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/fedetumujelo.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/sitirimisu.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/63800424619.pdfIn PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210609_0F24F7E00278FB41.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/wugedosazojedi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cbbe45df5---rufulirigusazali.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a4972af99a5e5a3ebd883c4ed58e3359/34552942227.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/8875e88a79a87673185e3af45792a7c2/58511583315.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/jenevamimixemimekamitipu.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d41f553b35d273e8ea82a6acbfead576/pigujugew.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/2bc500b2d32f9654e38bcfbb713d80f2/96444571719.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21e9b7c7b---77443404677.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/e06c5cb17710fc699c740fd8283319b5/89085048926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=winchester+model+190+trigger+pullPDF 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_off0000c975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC975 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 17244 bytes
SHA-256: f1794352b0e2f315bfc3808cdeba9b4e4158caa1eac72055fe520a5bf04a2f38
font_02_sfnt_off00010e1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1D 11232 bytes
SHA-256: 2706bd89ad1e53c7bf1c7b38a4fa98eb19c18b5224179f5f0eee354e95071559

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