Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce329581d42b8b4e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 17:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bf572124c420203631df3ab3dd310a6 SHA-1: b09d888e558e2570ad53e35c7979c0730bbc33a9 SHA-256: ce329581d42b8b4e0aac74d549ffbf087dd4e445fba528d90bcf77ca1f74ea4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to other PDFs hosted on compromised websites or disposable domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hanurichurch.org/ckfinder/userfiles/files/vesafolejobofid.pdf In PDF document text
    • http://ivankotov.ru/img/lib/file/mowago.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/wemerefemulimuvuwadebezo.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f619cbe171---90098858986.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f3c0a61ed186de57238a66ab8a6f8ca9/fizikogevet.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/b545990d206fd2aa6d6597d988388464/bobulobuzoteluzodasuvoja.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/20329471414.pdfIn PDF document text
    • http://halmar.info/userfiles/file/kuzunuzarigesedipe.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/volez.pdfIn PDF document text
    • https://soechi.id/userfiles/file/durokajijigupug.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/df3e3e1508aa8e11fbb99681fc983ea1/42412356461.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/jiridivudiwox.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079328d5a524---vokomaworazujebubiribiw.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/42905204755.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/56474203071.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/54204590395.pdfIn PDF document text
    • https://tappowine.com/file/61392579120.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b271807ad8e---vizidijofemaxelafejuzema.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc87b1579---zekaxoz.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df53617e83c---ralinitogiwomijituru.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/kugesuzutipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=7th+grade+geometry+practice+worksheets+pdfPDF 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_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 11164 bytes
SHA-256: c39265feb3de7690eb47cc3f5b5df9c23c1ad317eb49e02b9185a7baf36e6d81
font_01_sfnt_off0000f9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F1 17836 bytes
SHA-256: c03a087d41c68850cd6e769b81fd83041373984b40215238ccf34041c872a657
font_02_sfnt_off00012846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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