Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae1ad53c801ebc35…

MALICIOUS

PDF

113.8 KB Created: 2021-07-14 09:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 75a77b6d466fe1cbdde0098c6f594ef1 SHA-1: e582a13b4c77f326baf4f43862c9b560a8f47ef0 SHA-256: ae1ad53c801ebc3572cb734c87580dbe913cf6efcbb42610e1dd13b8197542d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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://chcial.ru/uplcv?utm_term=cerebral+palsy+articles+pdf PDF link annotation
    • http://thunderstar.cn/userfiles/file/20210521033234157231017.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qu5bpocm5vvleolaesg53pq1s3/jufudelulujovitegarusemux.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa68f37a74---43395149233.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/tiluxirorabilesanowe.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/aa641ddd39c81bca784eaefdcf893b74/73697500228.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/ms6vs7vjcd7h38358ml7ds3cp1/kalatiregi.pdfIn PDF document text
    • http://myphamasia.net/upload/files/95434664189.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160706a0208df2---97961529148.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/66368654862.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b12d99fa6---31786772566.pdfIn PDF document text
    • http://solsethreunion.com/clients/f/f5/f56c6d7ba488b74ef40bd02d3fc4d0b2/File/35383865476.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/45693277459.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a551e18b6e---71139837270.pdfIn PDF document text
    • http://ndt-ultratech.com/files/51430244221.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b46ba3f18---jufejijomemokire.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/wevaxusazunafeduwi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/75ede2e57504770a0a84dad1862b062b/69685863030.pdfIn PDF document text
    • https://medtek.vn/storage/file/40658013514.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/funuxojeziwitek.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088859766b13---fenip.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210621000915.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/359da8e57b3019d0dab0317b3cb785f5/dijesumira.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/149c36d134067522cad0967ec27906c5/71829800563.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_off00015977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001718e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1718E 10676 bytes
SHA-256: 04fdd98c7d6b48ed4ecd16cf3aa2b50e44d3c36a3898c7d9d2cf2fcfc0d5e81c
font_02_sfnt_off000189fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189FB 18480 bytes
SHA-256: 2de4edf8b095714f934cdfb3056e9940178629253145422ea7dbc6075e816629

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