Malicious PDF — malware analysis report

Static analysis result for SHA-256 5beaca85fdef6432…

MALICIOUS

PDF

77.6 KB Created: 2021-09-17 06:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f5b88c40dca8f11aa01ec85f4e835d5 SHA-1: 24b9a41dd87f14fe2a857ee6e6d280a9abff43f3 SHA-256: 5beaca85fdef6432f06530dc4dcc8d0fd2d0d34b00aa0750d8d08d0a83339eae
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm potentially hosted on compromised CMS uploads. While no scripts were explicitly extracted, the nature of the URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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://cructi.ru/uplcv?utm_term=message+backup+in+android PDF link annotation
    • https://giaynangchieucao.com/userfiles/file/pegupewaragewewukudofowu.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/781775759.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/32694371481.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/50386193246.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613619d6c6c7e---50473237444.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/xuriwupetunapinosisuxa.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613620d0eeb23---82272544581.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/jadoxasiwizixugesox.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/linebuba.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/nakudixezelaju.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/dilumakoremetulaxobasivo.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/09/05/file/20210905_090538_182.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/20581838569.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/kbhfqkg8g0naedc7in3gbf301p/japetofedada.pdfIn PDF document text
    • http://prota.ru/upload/files/71593923128.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/bajetes.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/98452903266.pdfIn PDF document text
    • http://grandinhr.eu/images/user/file/ginodalofogavatogatevawo.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/ferulilezulukab.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/29968956085.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bqei93lcn6qbc2ule2bm7kmeb2/xirex.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/17385289575.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/44618322738.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614205446ce35---37518048264.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/55136784964.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_off0000cd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD24 16532 bytes
SHA-256: 886785f5693fa170a4031c66ea69534f460cac751a829a7b2b937749ad06a0ae
font_01_sfnt_off0000f7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 10868 bytes
SHA-256: da239bd411e3b6dbe2c3c7313226f54d139c2c98ff2c32a84f9cb80612cf3c05

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