Malicious PDF — malware analysis report

Static analysis result for SHA-256 286f8cfc7c601f9f…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 20:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b1de79d1811d874fcbd6b785a771f8e8 SHA-1: cdc28f4398f7d5650aab6e2411432b3df43eab80 SHA-256: 286f8cfc7c601f9fd13c3d6aeff82347e4d38d6cf9ee2893d39c6602f1a38b41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. The document body is heavily obfuscated, preventing a clear understanding of its direct intent beyond linking to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://queure.ru/uplcv?utm_term=watch+all+things+fair+123movies PDF link annotation
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab4177222---wuvovexazuvimujigugikuwi.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613944cad5cff---rodiginujegefunedupizuvif.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/navogoxaduwuweno.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/ruzinup.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/zosupuvuxemamowekekoga.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d1cd7a2ea---dalanewasuwis.pdfIn PDF document text
    • http://cx-gl.hu/images/files/zuboz.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/9000117731.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/kiwofetozen.pdfIn PDF document text
    • http://spharma.ua/files/file/8896018980.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/61243265089.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/26889541072.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/34400124697.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/49107570804.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/bekemitabebogaje.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/40672645020.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210910_868944D7CE78B6D3.pdfIn PDF document text
    • http://nurugelexport.com/ckfinder/userfiles/files/xepimovigopanuxita.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/81180574972.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/jikezulililanebilabega.pdfIn PDF document text
    • https://norservis.cz/files/files/19388489321.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/73757715576.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/2c3dce070e251c8c44761f84b54ad000/tosijimuw.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/64337869073.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/sesijolowabozovolu.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_off0000bd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1E 11184 bytes
SHA-256: 052bb9da9a114d93fa71892ccd4caa136b4de06d7bf2dbf259e37149cb077af7
font_01_sfnt_off0000d744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD744 17564 bytes
SHA-256: 1243ff70257ce576642fd6adaf6a1ee6988ecdc7a78d86a7ad6365425d45617a
font_02_sfnt_off0001052e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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