Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4445d733a541d6…

MALICIOUS

PDF

135.9 KB Created: 2021-10-12 12:31:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cc350aaf0dd9ce50d919df065704b7bc SHA-1: 79a228847dd70233b1c2c68ebe00d1e65bd41b89 SHA-256: ee4445d733a541d62aff4d0dcc3bf37962e19311495c8ac6f513f67396efe98c
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://sanidom.pl/img/file/22966976315.pdf In PDF document text
    • https://resicolor.com/upload/files/95670096723.pdfIn PDF document text
    • http://mweb.cz/images/file/78366144668.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/rubibusere.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/lasadupovezagi.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/57207759787.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/werarogakunegokedegoko.pdfIn PDF document text
    • https://onecre.com/images/content/files/8586523114.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/xorawezarifukerapetafe.pdfIn PDF document text
    • http://nyt.jp/p_images/resource_library/file/18124130283.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/simifogoxezipagomoxibikij.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/22755296148.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/jupibumesegof.pdfIn PDF document text
    • https://lasanisports.com/files/52135275137.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/g3tvovci22lknrq8lnj5tmgpag/78677286313.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/31632984859.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/5877925364.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d4ebb665---mevugewewatoku.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495f338a246---notolowinif.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1615021a95ab49---sulufuginodovigodozexi.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/21147052851.pdfIn PDF document text
    • http://ariege.proximeo.com/ckfinder/userfiles/files/revirubavepazedopowak.pdfIn PDF document text
    • https://congnghiepxd204.vn/upload/files/9048808540.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147cdff1d2c9---jafuxerakutodorefejiw.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=buttons+and+bows+alterationsPDF link annotation
    • 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_off0001a633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A633 10620 bytes
SHA-256: 65660fa2616a3afc20044cf228d8e846c8953658ca6ff5e33a1fbe7c65e07b58
font_01_sfnt_off0001beb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BEB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6CA 22736 bytes
SHA-256: 302e807b9ca73398e0cc1ab0d61660c9e9c51c3d0dfc49fb3a30702ce5291df3