Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dbc8a7e836621b9…

MALICIOUS

PDF

93.9 KB Created: 2021-08-08 18:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e36ac04aa0e42054e3ac9171eb62107d SHA-1: bf562c05f5510ef669517eaf17152f3eef7de6c7 SHA-256: 8dbc8a7e836621b95ba85124dae89b8b2baf202731be0a6e7f9601500e396b23
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that redirect to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The presence of embedded URLs and the overall structure suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=the+magic+shop+hg+wells+summary+wikipedia PDF link annotation
    • http://cungcapbaoduongcuanhatban.com/upload/files/girutizelatexu.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/35396415347.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ef269586a---9927105686.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/79975471029.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/58253779007.pdfIn PDF document text
    • https://monocroma.it/wp-content/plugins/super-forms/uploads/php/files/325ba0d93deddc662c0a64b087028029/15226823053.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc0540d8c6---7699377936.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/80774414673.pdfIn PDF document text
    • http://juentai.com/userfiles/files/88707766689.pdfIn PDF document text
    • http://cosmeticdermatologymiamibeach.com/uploads/data/files/85031257740.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3oft928t34kdnt6ulcm2ium53/zununake.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/jinulemakedemanos.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/jdj0hc517qpd9km9s5tfuih0d3/parikanuwelenexegisab.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/kataj.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/kezukalutibine.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c08f71734cc---87075035949.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/jupalitewasimurede.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3be84dfe5---70763631984.pdfIn PDF document text
    • https://summit-christian-academy.org/scauserfiles/files/86946265119.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/08cc3918cd0d646c91ef57cc967b096a/90560053493.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/95919476703.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_off00010c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C87 11116 bytes
SHA-256: 2252b9b4559c1fcce75be19f49f75eee6e6356739adfddce59bd653ef8b37278
font_01_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 16544 bytes
SHA-256: 9870661f5b7e10cdfa6058f57461c5e2e3ff35247283bac9d07e5db01d200673
font_02_sfnt_off000150a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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