Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e8d7d5ab0c774e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 05:35:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5148b0b9fe27a44709f107b215f7f321 SHA-1: b67940ac21ac1877a2fe514d7175bc9aecaccc74 SHA-256: a4e8d7d5ab0c774e02ee391e02b70fc42708ddcc45749cf86090838ba8179c9f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of JavaScript points to T1059.007, and the nature of the PDF suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://andreuma.madteam.net/ckfinder/userfiles/files/febumedilelatizivexizeba.pdf In PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/65163041931.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/zabelezuwusadeber.pdfIn PDF document text
    • https://brs.jo/userfiles/files/3441892138.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614505f78ec21---fatalibamokafugu.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/turagede.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5d5713835---66245408007.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161463e6af015f---25707778310.pdfIn PDF document text
    • https://sieseam.org/userfiles/files/96497534815.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/sutivefutuwovuduxubigarop.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/reruzuwupiluzagowifesu.pdfIn PDF document text
    • https://laser123.com/geektic/files/8089213899.pdfIn PDF document text
    • http://baoveantam.org/upload/files/61792213063.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/guduniwuwotazujunoj.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/jukete.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/79990338973.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32332747477.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/27134580919.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/76297106057.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/68335594170.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1614e78bbb7d8d---jisorukolujejomekowi.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/15170941651.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16140bc19647b6---11552560628.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gowolinagaburev.pdfIn PDF document text
    • https://www.miotsukushi.or.jp/system/ckfinder/userfiles/files/rivarawomipajirufabinipu.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/durub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=latin+countries+in+europePDF 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_off0000b6ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EF 16240 bytes
SHA-256: 3394ab622857f901abd94d47cdeb47568e1a3a6dadc754c5629abe875c32e0e3
font_01_sfnt_off0000e077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE077 10380 bytes
SHA-256: 2dc000a89f64baf0207fcd8016fad9c48c752c7fce84ce2cc6dccafd0b2127a9
font_02_sfnt_off0000f821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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