Malicious PDF — malware analysis report

Static analysis result for SHA-256 818c30f90f74c668…

MALICIOUS

PDF

71.9 KB Created: 2021-09-06 16:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3a5b0723542fc12b03bfe8dd15db9f2 SHA-1: e5590cf204a21ea9e26e8dd541c22ba5b547e22c SHA-256: 818c30f90f74c6680888d1ba7f5df8047267071fbc89de166f1b200871964f60
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=how+to+make+a+budget+worksheet+in+excel PDF link annotation
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/jikelezabogexutu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a4d4a16a9---waluzarafuf.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/70279667118.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/80746824052.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/ziwirukijitiga.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/95165707488.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/29294997777.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/7695727023.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1c8ed6012---gejagimepusemenuru.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b40bffb5689---97164020595.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/sumikubivetenodela.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/96196473055.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/jomebefawema.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/fb05b2045468cf55813087c8d8d59f7c/janiwe.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/barowagevepobinebali.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/24000575468.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/wefasewosemuwif.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f078fdf2---12624733020.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/16323813606.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/lenedeni.pdfIn PDF document text
    • https://anjingliar2.com/contents/files/badevi.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/91359858998.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_off0000b794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB794 15888 bytes
SHA-256: 0a92c56120ab4fb3e61f7fc1ee434adc73a02be268bc2f496edbf6f860b2db2b
font_01_sfnt_off0000dff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 11328 bytes
SHA-256: 0c7509970796e11dbbd0fa962975896371cb0d9e18dd1a60e5de9ffd2b2d7920

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