Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a6dc1825c56741…

MALICIOUS

PDF

260.5 KB Created: 2021-06-23 23:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 0a6ecebea76e56038bec3471737e2f1b SHA-1: a251424410325e0457722b835f6c0fe3f0061de4 SHA-256: 71a6dc1825c56741e974f4778e7eae26bf27e3c58682ca95b7496aa501bd116e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is detected as malicious by multiple heuristics and a machine learning classifier, indicating a phishing attempt. It contains links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to zooplankton identification, aiming to trick users into downloading the malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • 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://bagiez.com/userfiles/file/xabefuxobigezupolojepimet.pdf In PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3ef8c4184eecb51dd6fa64e477e4072b/mofazuf.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847f8d56f6c---59082372840.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/7386972579.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b08d1959012c67e87bce6ef04875ce81/80287919041.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/pesaludozonarubij.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd10992ce---laselugibiwiwofifusiwubiv.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2cd6c55d4---10500794592.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33728a8619---latipabo.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b82334d97b---niboluwas.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9ffe78731---nofulekufidu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/46748109993.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/6605002536.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=zooplankton+identification+keyPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003c2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3C2E6 5000 bytes
SHA-256: e4dafac5024899df03448fa3c1aacd9b5ad6b54d10f632cec8103b05199e11d4
font_01_sfnt_off0003d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D415 15136 bytes
SHA-256: ffc1f8f7985178ff99241b1c58d76fc8aca9eff64c34932302663a420a6417fd

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