Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdec2caed857e34b…

MALICIOUS

PDF

80.3 KB Created: 2021-06-26 15:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 41cb590cec5f1e722fcba048b9392aec SHA-1: 28deb4348ac9da0f6876676995ef2989c7d77d0a SHA-256: cdec2caed857e34b9476925a64e68d8d9dfe92e1182a7935e5861a3369847a3e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

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://krisoc.ru/uplcv?utm_term=grey+grout+turned+white+after+drying PDF link annotation
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba409d2d736---49603571243.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/73841998723.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16236678474131.pdfIn PDF document text
    • https://amblamy.ee/upload/file/pizig.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/4498fq56qsu7m5rtuhg08dlrb1/ligudokaxirilaxozod.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/14148566539.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/74528832726.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/puwikuvovakakefomuxap.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/89426189894.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/89349232627.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/37527352607.pdfIn PDF document text
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/16627691014.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lofusalonukija.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873411357b5---mifabewebebujuneza.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2e729e53c689d9b9ec54829aeae7d074/85309818546.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/vupixigirugojuboxugidon.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-4-29/20210429233233106797.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/wivovujabulimelofixatugop.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/nivelejudojiji.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/ujdd66qr1fb1h8vbo5ivrgmruv/taziwukamodalomogewaxes.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/446830189c7550813ed2b39a949d844d/damabulukojapoxabozefun.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b363449d6fc---24887617110.pdfIn PDF document text
    • 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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16688 bytes
SHA-256: 387472c139c1b7bd77e691f8c87c513c9ed4709d6671399c7707f4b98a1c1231
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B88 10756 bytes
SHA-256: d4d4608da7859be0275a36bbfa7548a59b8ea5313ae3345bcae63e7944cdf15e

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