Malicious PDF — malware analysis report

Static analysis result for SHA-256 27346821c1a68263…

MALICIOUS

PDF

68.0 KB Created: 2021-10-04 06:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 33413605b88223f2f4a7abd94ea3e83d SHA-1: 5153ef697445387f1d90d2b3b91df1eeec4e4279 SHA-256: 27346821c1a68263fbafbbaadf54809963d46ff2d8879bf0254fc3f8cac6cf1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and link farm heuristic point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/21183881020.pdf In PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/12836171061.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/14855ec42e54ac59a557fa7b26c4374f/71837904290.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/3833207369.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/51647879528.pdfIn PDF document text
    • http://coolscape.info/images/files/xofewuxejileleves.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/b37e53c84f21173c2d7a535615b166bb/61778187053.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/46a696cbbf91426389b2ee09b2d50b93/nodalaxevexakugimuku.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/163064914195813279.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f6ca968a155d0adf5f9013b9f709bc62/28121777891.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/lutasapap.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/kuvokogepuvakoliwiku.pdfIn PDF document text
    • http://dgjst.com/upfile/file/92989199351.pdfIn PDF document text
    • http://ucokampen.com/media/files/13501511643.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/tomajizozuxed.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/foguwemerabujezupenaw.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/24600789359.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/ratikifoja.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a2b5cddfce---nuwudinamanekedebokafi.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16156242edb120---17548343854.pdfIn PDF document text
    • http://wimborst-ceramics.nl/ckeditor/ckfinder/userfiles/files/40966930187.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/movukegamunizafamepopid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=four+pics+one+songPDF 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_off0000ad68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD68 15196 bytes
SHA-256: c62dc80aae20515c988350af5ad42fec08fe0feabe2ae5bf0781f97d531f87dc
font_01_sfnt_off0000d384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD384 10320 bytes
SHA-256: 108da1e0283ee3ab5e390baed8a09f8892d2e1b7d765d40c2713ed3f6e21ae34
font_02_sfnt_off0000eadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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