Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1beea6b90f8912f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-02 17:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ec963d681c9d7867c5804404e3ff6cd1 SHA-1: d3599ee8c429e562fa3fa6ca413cded009c4bdaa SHA-256: b1beea6b90f8912f172a098f944e5739c8014e0ccb93f60d301ebbf47e632f40
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://smidgel.ru/uplcv?utm_term=oasisspace+aluminum+rollator+walker+manual PDF link annotation
    • https://hanahana.vn/media/ftp/file/divikol.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b49a8ab69a---fuwavinido.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/xiguwireb.pdfIn PDF document text
    • http://chayka-svg.ru/files/mizisijazozulufutil.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/lurukemip.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pppl4nq72av15v73j5l1399374/fumadugotivabafox.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/68586626590.pdfIn PDF document text
    • http://thietbianninh188.com/uploads/files/vumanudutukirebokodu.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/delit.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/datapololus.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e5fa39719d8b92f2ee410f1d52e0dfed/83487653415.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/galipabidizedudes.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ac6e1f9edb8b83c7cfadbaafcc6f6583/salimuzuxapapesunola.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/xopagapupuzube.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/bekavabivibiwuzaw.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce6142627---7739282067.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q3pncgn6um40kvb079cpcfi3h4/81416100550.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160982dde608bd---43880251396.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160946ff75d1ff---27140048413.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/pugele.pdfIn PDF document text
    • https://aneri12.eu/res/file/25874928399.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/vosetavagesadodivobu.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/82207888592.pdfIn PDF document text
    • http://tencanpowder.com/d/files/12198530665.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4b32fab57cd641041a4cf32500183382/79004681186.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085df625433a---96062097742.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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 10840 bytes
SHA-256: 2fa592013556f62ea855d2718425fb808733a9216813d6c2732f6edae432daa5
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 17892 bytes
SHA-256: dff4d0d2e286aae1c552b9b855050b30050588a95f07d3b349e73beb310ab5f9
font_02_sfnt_off00012e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1