Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15ed0765e830339…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 09:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7c324b69de0c07efea17f39f3cccd46d SHA-1: b261f59f89d039d65d5e30cfa84bcd4792b4b6a9 SHA-256: b15ed0765e830339d423a30219df003705e76e7e8ff7145c2eac84ad6c98c7b2
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 WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers strongly indicate maliciousness, with the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirming the link farm nature. The presence of multiple external URIs and compromised CMS uploads suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=iso+20000+2018+pdf+free+download PDF link annotation
    • http://mosme.org/uploadfile/files/faxotaleriweku.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/43733796170.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210914104337.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cabeda5e22---67566144099.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8543ea778---55136277298.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613df81cce692---8977118394.pdfIn PDF document text
    • http://davcpundri.com/css/file/90809272376.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/xoruganubuw.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/zisuj.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/wajufukizugorinunole.pdfIn PDF document text
    • http://zerosquareonline.com/file/potasofikupurinejutekuti.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130315504433---nadabas.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210903/files/20210903161808.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/85308588307.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/jalajijojojopulunaselu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/f3ccde84db01eb03762e17cfc5b90483/wovoboluveladumad.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/dekanimuxiwam.pdfIn PDF document text
    • http://robbes.nl/media/files/2028788502.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/fufuvimebiwasexujo.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/24774371132.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613254ced6dd7---wugureg.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/wemugadasow.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109071217186481.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/95264263360.pdfIn PDF document text
    • https://hinaweb.com/upload/file/kifatajuvudirule.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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 10840 bytes
SHA-256: 248283700b02d5118185a4374ffc0f6b1cd24c3808e4366bd84768584c9cfcce
font_02_sfnt_off0000e588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE588 14892 bytes
SHA-256: 8c3e246c2b3c5ccea280c5dfdfac1c63df306dc7b896fa2c7eb4ddea4b0b0901

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