Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dafd8c615d00441…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 00:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1c843792c9c667171a357fe08649dd7 SHA-1: 998aaf99bc08e84ac805529b30d01df526850641 SHA-256: 8dafd8c615d004417a6a843b720c98c3d8f6efc2981e1a1e27d30654083f72f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm strategy, suggesting the document is designed to redirect users to potentially malicious sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

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://ketchas.ru/uplcv?utm_term=infinity+war+free+online PDF link annotation
    • https://atrax.hr/files/busajipadagopu.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/34174381387.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/70029692803.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210911133026.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/nuvujadopipazoroniloz.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210915113004.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/barotozuwipisisaginaw.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/14828593958.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/90932776944.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/jutifakexuwiruwivuboz.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161348c0e374f3---67605905153.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/biligepet.pdfIn PDF document text
    • http://ormansagszive.hu/upload/file/32858932532.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/893d13ecab48bdf238ffd1f80b097da0/12402230056.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/96bfb5f717939443f9516b25523f1ccd/72350216580.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/69762641043.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f39dd52e11---4310427563.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/wenafoxibo.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/menife.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/depabutumatixipikupawura.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/72973483600.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131310fa5034---24151584522.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/besepofosixabevifavemeju.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37C 16860 bytes
SHA-256: 92f1fe3da8c617152e66e794b0b784f7b629a40c11743e9c879c30ab66ecaf88
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 10192 bytes
SHA-256: ef4fbce90d2aa43aba02d438b8c4212ddd692b1bb26edad00e013476c59041d6

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