Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6da1700c20af84…

MALICIOUS

PDF

76.8 KB Created: 2021-07-04 20:56:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 2cd5bc0de23ce4b8f1cf2bd26ee6ad50 SHA-1: 1be69c6de66274bccfc3688307ba940e8cc16e5e SHA-256: bb6da1700c20af84e878ccdb3ab66a5f6a4e0bc83fdd5642e80682d95f376e15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF containing a link farm, with numerous URLs pointing to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate that these links are likely used for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c18b8a6af73---wumozo.pdf In PDF document text
    • http://caratow.nl/userfiles/file/89836462470.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/1d113662dab9c538bf1fa6721f3c16c5/27615754329.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/cbb753fe2a2b789ef9b2dfa820e2b220/regogoxomegatumawepedo.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/66406864776.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/97ho85kldfvsnqp7hm2a2u072a/dokidizeriziju.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/gakakomijajilarobetabopad.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082599228b2b---sefopipadazobalo.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/5625013672.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/68692303848.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/7eeeefb1c6e5f34855b505f196d4750c/91726184332.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/vupiw.pdfIn PDF document text
    • http://maihome.hu/admin1/file/jerejejajapenupewatomek.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb02d390e57---90842127867.pdfIn PDF document text
    • https://besteva.com/upload/files/89375427378.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/jupigo.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/72248796316.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/9836b3fd6fe6928464a706d230cebab1/putuxaz.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/99828715260.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/67929340232.pdfIn PDF document text
    • https://adikkedua.com/contents//files/48843295781.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/89224191266.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa819aafb08---26885085012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=5+feet+1+inches+ideal+weight+in+kgPDF 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_off0000c999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 16784 bytes
SHA-256: a126d89efc7b3c6acea2138aed6bafde68f43d260fce04fdce4c6b9b8811bc41
font_02_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 10804 bytes
SHA-256: 8f32787b446df4fefe8f09163ed50ecd231566a9f223b84bdf72009a0cfb0715

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