Malicious PDF — malware analysis report

Static analysis result for SHA-256 114b52896b520519…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 01:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6a77a2a07a744057b091dbc9bf55db8d SHA-1: 698b7b3c4e01448799d8bd3681906bc9d0f54a93 SHA-256: 114b52896b5205194c7152e65eec45cc99d6cba177a65a15bcf3c3a96167efc8
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://tour-paris-guide.com/cite_imgs/file/24058535211.pdf In PDF document text
    • https://gyn-koe70.de/obrazky/file/pivetawuzusamibenudemi.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/luvifiw.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/ijj7llf1gl29ho3vjqqficjd6c/37353142593.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/60na23jrnf7epufc793gig6is9/fogumo.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/65810008171.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16119053ff03bc---22225006548.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/xusavajifowa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a21263f62---98128263048.pdfIn PDF document text
    • http://zuestag.ch/userfiles/files/13550308275.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2765d1245---fubepaloj.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xirekofedafomoxafofotetod.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a0e3d519f66193722bf4313d9abbf52b/61568268492.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/e80c6f103fe93626a165bfa497ec3b19/85473266317.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/fonila.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/82333695397.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/9f805a8984793b00de3f4d3be53c54f9/69263788865.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/87030968095.pdfIn PDF document text
    • https://vientangluc.com/upload/files/lokowulap.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087b56453dad---rofaboxanurolupusu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161290abb81bf2---7174797253.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8a22a64a8---79403557044.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/sidawezologepekubalol.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/72184627820.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608618f933894---93006467162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=convert+word+file+to+editable+wordPDF link annotation
    • 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_off0000d0ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AE 10504 bytes
SHA-256: 14a8bc6644eaf9af63bc0e1b07002f3ced5d8a63f6119e8ef39f0e5e86f12ab6
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 19252 bytes
SHA-256: 0f047eb80fa140b6c7bc7fd206f7b9e3ed9b512dfc4b169b410161e8251e7db5
font_02_sfnt_off00011934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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