Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2a6ce4f24603257…

MALICIOUS

PDF

99.1 KB Created: 2021-08-02 21:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cac0605ef20693bc46467fdfcf4e376d SHA-1: 9d01c72060b5092f7959ec532253bc331f2d62f0 SHA-256: b2a6ce4f246032573738256c3bdcb3475b190e5d8c182d1d3e13f9ca29260071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=compiler+construction+principles+and+practice+github PDF link annotation
    • https://pioneerlift.com/upfiles/editor/files/piguwabulezugem.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/rukebilolen.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210728/file/1627419331.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7935352fa---95178644134.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/somosafutuzorexujuv.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608743cb75d20---66659189694.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/50309009877.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad99f3b3edf---3053881763.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/2rphr8r430gvu5f2u2lqqdjl11/wamuxabasisabiwepu.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/sfnjqeteboom5mu5qut8nocob0/vumuxa.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/zuxuborufobijofiwazufa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7b571fa8767ac707de668f69bc2bde9b/31003331670.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a48eff41e0e---namilegejaxini.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/xikadeleral.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/10422302421.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/jigabexonifuxexitiguziko.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160727f8a4cccd---71743688338.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/267fa35b6ce2c8f93f328f3b3c4393a6/jonujomadugodenise.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/74365557321.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/b57e473af857d72da107b6a2a4039404/fawekodazawegesiwizi.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162482336112113986457.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/nvb53vh4q040f95c766u4da8up/fudotabewiwefudagapuzal.pdfIn PDF document text
    • http://apvn.info/userfiles/file/burugogebusipolivew.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160725a119df13---79707313118.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB9 17828 bytes
SHA-256: f86eff0f9d2c07403543ecd5a3d9a1cc908672eb9f489f12eaca7486ff6b7256
font_02_sfnt_off00014c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C63 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_03_sfnt_off0001633d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1633D 11232 bytes
SHA-256: 9e48a7c045607c65620a2dc8451eb668de245c3142b5b54f988c7f5506b32ce4

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