Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ec6840af0c667ac…

MALICIOUS

PDF

90.5 KB Created: 2021-09-13 05:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40222746e3012370178f3e60679fb912 SHA-1: 5b8f7c107fd1f5f3fd85bd671960dbfbf514a2f6 SHA-256: 2ec6840af0c667ac0dd2ed9890430bd7f50330361cfec8dc21747bf659c5f32e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm hosted on compromised WordPress sites. The embedded URLs likely lead to phishing pages or further malware downloads. No scripts were extracted, but the PDF structure and heuristics strongly suggest a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6306

Heuristics 5

  • 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
  • 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://catamma.ru/uplcv?utm_term=use+quiet+in+a+sentence PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/8lk595qehug1lb921g4f42c9b6/nimiponozujelejufib.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/88005809250.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/xomogoviviwepekolowo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/68588325761.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lfvfqofqe9fcgb0daa3hhevo33/13469691000.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/61283310868.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/64461492478.pdfIn PDF document text
    • https://eric-parnes.shortex.com/ckfinder/userfiles/files/lipadatoduto.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210907_230221.pdfIn PDF document text
    • https://wittnebel.dk/file/67571659093.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210909115557.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/19372568625.pdfIn PDF document text
    • https://buka.ru/sadm_files/28729420977.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/jujesukumifaxaxorabolun.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/pugexuribadome.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/sedozidekujadi.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/dizebitujaxafajazevolemux.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202109120638041992.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/xiretejenobuvaruditek.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/ragavagegojevuz.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/59892376990.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/44585916e63266f9c903133f8154c4df/wexetut.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/kusupaw.pdfIn PDF document text
    • http://coumert.com/images/file/42619420175.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a9679895---67821979562.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13338 10212 bytes
SHA-256: 8725280db5baa24ca6180c6ac2b8da03d9aae4f1739dec49e89cec65a7c39302

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