Malicious PDF — malware analysis report

Static analysis result for SHA-256 16421d4c28a08738…

MALICIOUS

PDF

81.1 KB Created: 2021-07-20 09:08:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 779662289a3069418b7f79a7760b7bcc SHA-1: fbbebbb33e06785680dec489113ec3fd569c453f SHA-256: 16421d4c28a08738d70ddb784bfec691819c220b50d96cd76761dbebcf2e5b58
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm or redirection mechanism. The presence of these links and the overall structure point towards a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091419198aba---91367138044.pdf In PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/e2b7c0e511d317410133ea28f63cad38/99006364771.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/64250766773.pdfIn PDF document text
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/tubotavinasusikasot.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/senogezivobokekibufewo.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b87001b874---loleg.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079879fcc013---2204982133.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/857714574.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/junowunubowimo.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609f8ed4af3d8---wufebovuludewozoxidew.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b3a087fb7a060c3682d9cf1858c430ae/62979963135.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/46ve7es0rg299m0es8k7bmel8d/91120341453.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/514cd60bcfcfae8fc0136efdd17a344f/kitasuwuzenidekeditegoden.pdfIn PDF document text
    • https://dm288.rs/slicice/file/wimagugasaxubu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/74693b23ce4ce25a5bdd93c212fc3d45/dibigetidi.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/38fa5e379952831656d682b5d49080cf/gefelaximefawip.pdfIn PDF document text
    • https://best-label.com/upload/files/xilonarofagegor.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/dapexobobejesaropu.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/87126657924.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79d79bfef1---zakuga.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/a431dd0d50c5391c5b06f85bc2b63120/volawuweguxotavu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/06/30/file/1775912115.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=autocad+2017+product+key+and+serial+numberPDF 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_off0000d98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 11448 bytes
SHA-256: fa85ae042b9354e468c90979748f6beea7532c89d894543b4dd5d43091ec7d0a
font_02_sfnt_off00010ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA6 16316 bytes
SHA-256: cfad9a29b193d302fa2d38164c91dfeb5904513fadd0f70478dce0c6c1f00909

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