Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a0e8e5beea497b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-03 13:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afc4273e134a4ade78dc7fa3ee077e4c SHA-1: 80fb69c8ff80fa2d56a68c484a044efd1d3d2dad SHA-256: 99a0e8e5beea497b630d8ca6069f00ec24a0d2fdef01e574c5348c4c1fc990c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=cpwd+dsr+2018+pdf PDF link annotation
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/udoaroe1sshl71mqsnrak2oo36/59326173484.pdfIn PDF document text
    • http://konferencii.org/js/ckfinder/userfiles/files/sazidojux.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-18/20210618040355177307.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/0hdnm1to6sfo4a3616ipdfg341/86335592880.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210823150152.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/on79j2htiendkf3bfkpv274ee1/61603666096.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/didoroliz.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5292dc6e5c---buzefanuz.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/gipukuri.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/27229bf85b8e9dea695ae99ed2acb5a0/xakununebunogibi.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/91332674366.pdfIn PDF document text
    • http://lukinserv.hu/file/25839211122.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ac57fc80---domibibufinorexogiforiv.pdfIn PDF document text
    • https://whitesal.com/data/images/file/8929_20210614032109.pdfIn PDF document text
    • http://temple.mo/userfiles/file/40714954180.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/zureselagubazosakoforow.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/93633632415.pdfIn PDF document text
    • http://htwy.com/upload/file/duworikebeg.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/30411449645.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131d4934ef06---11769059580.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/fokitadija.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/76967535900.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_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 17972 bytes
SHA-256: 23c64065a4887d2a413d809d0e6182fb4af19691b5ff486e919eec58ebcd7346
font_02_sfnt_off00011f66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F66 10356 bytes
SHA-256: 65c4a3219cf7bd0ee5eb6f951b87d36cfc5580596929a3d5e4c7cdc432f25fba

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