Malicious PDF — malware analysis report

Static analysis result for SHA-256 6324ca3ea41bb4e3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 09:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d80367fc0d82572a16071adf27483bd2 SHA-1: d7d9eefaa5dd01c7f84ae3eac60bdd8e093cbecc SHA-256: 6324ca3ea41bb4e3b6d81c7cb0b85a2cd45098678814a5dd4bc04f6d2eaee8f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload locations, indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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 http://mitcostruttori.it/userfiles/files/72228732888.pdf In PDF document text
    • https://thediamangroup.com/_images/files/71444761617.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/12948508502.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614245a91ee44---88047074058.pdfIn PDF document text
    • http://zenkatsu.dk/files/guruxukumi.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/dikimijeragen.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/farunuwofida.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/pepidixiwinitajapusufi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/36368699372.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/vaxiwuno.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331af797318---volenibikodazuwi.pdfIn PDF document text
    • http://langyupharm.com/upload/files/zoradivinigorikalidafa.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/fozuji.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/robivafafo.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/42634184048.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6ornnei95hn7jr4hn5idtqjokm/36269384681.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16142cda6504ec---rujomubivagolegukevilufi.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/31069369051.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/tesawigofuvimagefunijuw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1aae62374---71718184235.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/57209337090.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/13757803919.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/jabevipitifuvorosirixara.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+gyro+sensitivity+for+pubg+mobile+androidPDF 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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 11312 bytes
SHA-256: ba5a0f97289283e84e82a74d0a3de9499be5d9187bd013c797145c594cce2ae2
font_01_sfnt_off0000f5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E5 18064 bytes
SHA-256: ad490ab2942cbeae20dbae62420a4402b407c7e3428243029974e92ab26cd540
font_02_sfnt_off0001243c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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