Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bafae7274a1a8e8…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 22:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f37748fbfa7598d050d0ad059ca6ac4b SHA-1: ae816a075ee76321b221f1834adae85ddd9503b6 SHA-256: 7bafae7274a1a8e828b751b130a27607f35bab03b1567fb5612180f882cb0082
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to other PDF files hosted on compromised websites, indicating a link farm designed to redirect users. The ClamAV heuristic specifically flags this as 'Pdf.Phishing.Trojan', suggesting a malicious intent behind these redirects. The presence of multiple compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3686

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://crysiq.ru/uplcv?utm_term=manual+bookkeeping+supplies PDF link annotation
    • http://hzbmsj.net/images/upload/File/vewizu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/57e42f82484222ebf81a6938f5fa6289/990283554.pdfIn PDF document text
    • http://mp-journal.com/media/file/pawufunarudesolarudot.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/fevokotakiwifujesigotodi.pdfIn PDF document text
    • https://wrd13.com/force/file/tugofibamezeduta.pdfIn PDF document text
    • http://skazka76.ru/pic/userfile/nuvemavifasifaz.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/81225429147.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gui27uv7ef923qn2s6sgdbj2as/mixef.pdfIn PDF document text
    • http://xinyuemu.net/assets/202108/files/20210807004437442851.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e4d5dc7e6cdab0fa397de7b2fa376f99/5600807043.pdfIn PDF document text
    • https://foulardfotografando.it/file/42441421676.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/59143b4130d3a7cdb53106583f4a453d/715129365.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8e6252a4a---27601060289.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e0f7f0eb3---savut.pdfIn PDF document text
    • https://areicon.com/images/file/10606084093.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16104745e0d6b0---pebezaxapinuv.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/pagusu.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/jewidejowoz.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607759dbbbae4---minifaz.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/mirifirowujokovaxap.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/pifewokixa.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf0163f451---45344062620.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/xejojakesezoluboru.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/31/gevizepobodevefisu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a8ff6bd6e---37766295952.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/ebadf3bcb97b7612e48f8d07c661a698/sajufunuruxi.pdfIn PDF document text
    • 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_off0000dcd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16800 bytes
SHA-256: 3ad8bead9ec8e1a86f21db49c0239985afaab06390cd27c91d96c1da144513be
font_01_sfnt_off0001086c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1