Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5044f2a07f770c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-02 12:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 373856c0854d97d36d11271615ba8cc7 SHA-1: 74f83e5c7bc0b1e904a50da427d4504dcc633580 SHA-256: 2e5044f2a07f770c78131674e99fbe3ddc3513506cee6c22ea2f6384bbe4c858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such PDFs for link farms, often associated with SEO poisoning or phishing lures. The presence of external URIs and compromised CMS upload links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://coretry.ru/uplcv?utm_term=pegando+fogo+abbi+pdf PDF link annotation
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/36178883528.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/78410439019.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/nnqrdi0p0q6rf2slk4sq77pfh2/22440711156.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/xakogonaduzinodejokabujen.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/56677916615.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/96609949162.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/zetubefoniduputebezurumo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3747d4e3a8---sovomusitilofa.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/20285296209.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/kakasimatogikuvesanu.pdfIn PDF document text
    • http://gr-chem.com/upload/files/11360600130.pdfIn PDF document text
    • https://langumeistras.lt/i/File/95578545790.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c23c4a52386---valiguru.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/8980ef99130888108921aebab47237b8/54545025894.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/f41e7a457b47295acbcdad1431b00bf2/kilezodumagezesusopag.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/31322039862.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741a4abb336---85039533471.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a546754804c---vofumedo.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210505124045.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8ab18852cd---92313641677.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_off0000b5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B2 10400 bytes
SHA-256: bd26eefbf8bb1f649cf0c5476cf00cba07c15b43ead1de7cf5704bad2674f07a
font_01_sfnt_off0000cce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 16576 bytes
SHA-256: dafd78a2b7158d7cbccf323c9c2358e168ee8c0d6a43eb5e58e3bb2f1ec66f1c
font_02_sfnt_off0000f790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF790 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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