Malicious PDF — malware analysis report

Static analysis result for SHA-256 c172923cacf21dfe…

MALICIOUS

PDF

71.9 KB Created: 2021-09-19 20:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02738d614d984c23553cbbdc4e8accca SHA-1: cee06e163b7827670c8f836b1c72f4d71f135df1 SHA-256: c172923cacf21dfe3897d3ffcdd4bb176fc7782981d9cac5f778e2833a9d4fc0
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and being a potential phishing or trojan distribution point. The ML classifier and ClamAV detection further support its malicious nature. The document body is unreadable binary data, but the presence of numerous URLs pointing to compromised CMS uploads and disposable hosting indicates a clear intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6550

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 http://medtravel.lv/images/hand_uploaded/files/baxosogo.pdf In PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/e5951aad09a0dc0669265bc803333d76/58550551165.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/lazegivamufanalu.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/80818406572.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139711920de5---32987334070.pdfIn PDF document text
    • http://nprofit.hk/userfiles/57877261684.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614488d30989c---9568088079.pdfIn PDF document text
    • http://1carl.com/userfiles/file/kezumijoneji.pdfIn PDF document text
    • http://apothepharma.com/upload/files/55110824136.pdfIn PDF document text
    • http://art-ball.net/files/file/judusopololobokepomuxex.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/88442208140.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210906063732.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/39480299927.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/15118462107.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/20593505043.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/51687558479.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/96393330955.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/14094022483.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/16910329324.pdfIn PDF document text
    • https://uudanbury.life/files/file/67876961800.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/gufoborewuruxidumowemojor.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/funojaf.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/papomulegovib.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109141109471923.pdfIn PDF document text
    • http://ssteelelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gaxusafaxusisasaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sk+mitra+digital+signal+processing+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 11128 bytes
SHA-256: a5d5a3f380de175bf794dd1654b2f8aca769c93e468ce2d1492dc4167d197403
font_01_sfnt_off0000f2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E6 18632 bytes
SHA-256: a19dc51b31e7b073b9980eb5bc0a16565133f6c568a5d3862041aa2f57f3c962

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