Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9938ea9253cf88d…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 23:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c29da3934491e4e5de42c293118067b1 SHA-1: e5a6171c9ac0f940dec0de5877ce8a2fa9e3b56d SHA-256: a9938ea9253cf88d120cee884ca376f4c6e5f93b524246c139db1c7a46e9cdb1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the 'super-forms' plugin for file uploads. This suggests a phishing or malicious redirection scheme, where the PDF itself serves as a lure to direct users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c6d9847027d10cf5af88b95d04521287/jikarorawufuret.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1a74c67ecd082179efa94efa3bd6d80b/xuleruwigesawavaz.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/278l72si00dkl558pvbma15mhp/55581305626.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/54ce7cd937e2688bfcef98c8afca29e4/55822369353.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/kt1t2dagf0brv49flkg5kkv2na/38801767882.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0fb9aa799b19f751beafbe06002b5b6b/79919463866.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1c52293a---nilazul.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e6fb5d5e5---44975287555.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wuzenetode.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c79ed6d911---pinakexerozifagadekatesa.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/qj62lcu0p6js3h23uel7e3fsvg/75371923080.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/71963446620.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe98bd3bd0---38856342604.pdfIn PDF document text
    • http://ellerbeefamilyreunion.com/clients/874543/File/pikodipuferiwuxusatinad.pdfIn PDF document text
    • http://skyfestival.kr/ckfinder/userfiles/files/fujunanepukemezolujuve.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756da6cc187---milox.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89e5e8f65a---dugoremevuvelozoguk.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/ronov.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/f54b79a449e68e995ff583034bd3d6bc/56545286615.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/fatozevenevojuvelugiw.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/devorux.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/silexidaxubebaxas.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/pokibovebovafivibukitunup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=definition+of+upper+middle+class+in+indiaPDF 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_off0000f25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25A 10884 bytes
SHA-256: 65f45cb4a21060771139932050f53281958aa49ddafe1491b194cc11d51bc7de
font_01_sfnt_off00010b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7D 17088 bytes
SHA-256: faa366a558c7d3b18dcf521e5402b61db0aca07943346cd8ee9feaee4b7393ca
font_02_sfnt_off00013835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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