Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e08d456b270097…

MALICIOUS

PDF

85.4 KB Created: 2021-09-09 20:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 757be4aa9d4753c2ade988d51bd581d4 SHA-1: 213526d298616ca576ad1c158632d6bea46e6b3c SHA-256: 31e08d456b270097d91d36799755833cb27577e365b69b55a67fc5cac9d897b6
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of external URI heuristics and link farm detection rules further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thingsantiquesla.com/userfiles/files/98405981639.pdf In PDF document text
    • http://ityab.com/cache/fck_files/file/gopuvinig.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/d8cc1c4218ca208a8787a033a8b24dc5/zazemisapanaluduwizezodu.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/57229856864.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/92392337849.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/sefezovosufugo.pdfIn PDF document text
    • https://onwater.my/uploads/file/gekelamavixademije.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///sesekoramebiwazumapefozox.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210902045835.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/57760515542.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c42b22921---94790808657.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/11225865222.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133252e1f326---82578347454.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/pexukato.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/devazed.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161316a1e754d3---68150762210.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/25334812444.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/vegadoxojefa.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/laredokisefikut.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/72341204137.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/52009218310.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/xojawobikoxu.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/waxuguriruzibib.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b32c13654---rodopixukakozaf.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/mamuxenizidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=android+voip+examplePDF 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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 17704 bytes
SHA-256: 0e233eada99c1a1797989783d8dfff09c37e164c2430ae6c175abca8c2ab988d
font_01_sfnt_off00011887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001309e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309E 10436 bytes
SHA-256: 3eaf3749baecb902e525964c6aed940bf2c3c44b47cb137a51e9ae28c15b7dac

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