Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21bb9cfe8fb0d5b…

MALICIOUS

PDF

71.4 KB Created: 2021-09-17 19:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-04
MD5: 6fe98fa23217d724dbc4fffc6c943529 SHA-1: cc80b8e97dc6ade200d995db6405747e3879dbe6 SHA-256: b21bb9cfe8fb0d5bd8c75519853a437230ac622534e60c96639ef9831e41c82a
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/8vsb273rs0m54m4earaan330qv/nopagopefubatukar.pdf In PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4e128f650075df9f45efbcc8ae53a575/91739666345.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/jokotev.pdfIn PDF document text
    • http://cuanhomkinhtoanthang.com/media/file/jakutowu.pdfIn PDF document text
    • http://annabarons.com/files/files/17571542096.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/7n796g9n5866hmpjrbbkas7fv4/37589674523.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/16363096402.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377151c3eb6---nejiwuzolojusogidoxoro.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/gatavofubisanudik.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/buwixujap.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138b7cf57edb---nitiw.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141693b74a87---47456005513.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/39206ae7e798a3709bf054dff2e94678/rejilexilezevometubub.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/94465163931.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zazaxiwubovipenuda.pdfIn PDF document text
    • http://progetec.org/userfiles/files/popetak.pdfIn PDF document text
    • https://matratva.in/userfiles/file/jabejewafuxufutajiluga.pdfIn PDF document text
    • http://apothepharma.com/upload/files/jinegebira.pdfIn PDF document text
    • http://taxfreepoint.com/file/gixidokizikab.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/hos6lhurirs4ua2fbnckem8c53/40264185616.pdfIn PDF document text
    • https://novsport.com/content/File/xegem.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137457dd68fc---39872705896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pokemon+emerald+apk+free+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AA 16340 bytes
SHA-256: f8fc888427ca4fa47a9369d30208f3ce2c9e2c23ee00b92c76fc5e0e4577b7db
font_01_sfnt_off0000dfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAB 10480 bytes
SHA-256: 72e9a0bbd2bda06bc60bd5e791b67945fdb28423fc49352aec6685d29e14a87a
font_02_sfnt_off0000f77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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