Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6aed7e0b47af44b…

MALICIOUS

PDF

69.9 KB Created: 2021-09-30 12:20:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e65d45af84de8222eefc363ddd594df1 SHA-1: 8b2167bd6791de76cef56e0b69380222f00c6bc4 SHA-256: f6aed7e0b47af44b9a191a4de8873f5577aa657665c6bc7023320f9cb0916b5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be part of a link farm. Several heuristics indicate that these links are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://medvor.ru/uplcv?utm_term=what+is+the+best+game+for+android PDF link annotation
    • http://kondicionery-fryazino.ru/upload_picture/file/39661758867.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/34327585880.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/12398422578.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/gevetojuz.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/db4eee0b8c7f7c0fdb925ae375e6e829/beguvofinimaxofosas.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7479cb352---feriwipigegutoj.pdfIn PDF document text
    • https://newshieldinsurance.com/demo/gsa/final/images/file/gabapomuvu.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/diboganuwosedakasu.pdfIn PDF document text
    • https://interconformity.ro/images/file/10704906651.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/20027354585.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/milibawise.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/62603342831.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/42942859205.pdfIn PDF document text
    • https://aksusu.com/upload/files/goburatupex.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/rojusowinodega.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/74600173663.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/68118150550.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/wezagejepitejejugax.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/u8vafn6hfcq1nsfvnj8pujik13/dazimonopuvi.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/71780082378.pdfIn PDF document text
    • http://jhdljz.com/userfiles/file/1631387203.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/xupaxodudinesulolabod.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_off0000ae75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE75 16988 bytes
SHA-256: b246659d8f6af525f67c5b1147f4601849454e9674d4677056cb763c97b158d4
font_01_sfnt_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 10888 bytes
SHA-256: 74d6e9f11b8503759e991dfe07e511d0d449f872ca4e955e6340a4e011386986
font_02_sfnt_off0000f22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1