Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cd59d04c6cc0bfc…

MALICIOUS

PDF

88.3 KB Created: 2021-09-12 17:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ff402ed3670c21b29d37d9baea66f908 SHA-1: 1813eab53ae4d33f78d1a8154994b56e53d25ce3 SHA-256: 6cd59d04c6cc0bfc4944e9675a62f8a56095d454506d57416b49e3165d37e471
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and presents a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. The primary function appears to be directing users to malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efc6013ab4---73738643550.pdf In PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3f4c61b8---sogixekatadoxav.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/rolupokeramaxifilepapomu.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/roxojowatugidabop.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/44899097371.pdfIn PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/50224587507.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d63d10de2c---1097425701.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161306e053bd2d---kesaxatonamosu.pdfIn PDF document text
    • http://oris-am.com/editor_up/83802909662.pdfIn PDF document text
    • http://livestocktool.com/d/files/tuwoxajanulizevotibu.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/99696693255.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/ee2c58441a8ecda47d4e3a9de55722de/valatexexijamijekaxakorar.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/wiruz.pdfIn PDF document text
    • http://thaiwoodengames.com/files/upload/files/wiwukibid.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/bitafowevurawigikigajup.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210909115557.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/zefifakajesotapitubafev.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/wexetugopewibajidasos.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/likufunufizinusuritaxer.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/24505585243.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/jimixikoxusofurar.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/nexuwavaloxali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+11+no+chat+headsPDF 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_off0000f27b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27B 10452 bytes
SHA-256: d28e75fd8c4443d9fc3b98c93393dba8e4335d75f33e1af95fab238bc0660513
font_01_sfnt_off00010a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001224c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1224C 18792 bytes
SHA-256: 1fbca20a9781c04d2834df3cb6eb4028c1e59824373b02287415eafc715306c1

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