Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e3d1dcca883b8cc…

MALICIOUS

PDF

144.7 KB Created: 2021-07-20 00:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 20842045ac0d712e8a997b6d31628d5f SHA-1: 5b41c54162c4588f41a03861cbeba1bc7d6ef7be SHA-256: 8e3d1dcca883b8cc0f7e4e5f8672b8c360b3da96ca83dff59fb649d092647448
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. Multiple heuristics indicate the PDF is part of a link farm, with several URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9739

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://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/cfb439306288d892ffd18707d6b109eb/jivarano.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b34178ee1---vuzofodigovudufi.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2107090153000353792jm46r.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/oi2n7201nrbpg8hbd7ddig0f8f/lemewutawejufub.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0fe57ec6c6392beab06305452427e0b5/50823536428.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2r8ufhkqhvumuccg9s285k9v30/tupifezobupalu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caeab7fb18---53962415050.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094643cac257---jususasa.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080fa785fb68---13493832480.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de27ea7239---getuxusonolunifogep.pdfIn PDF document text
    • http://dothi.info/images/files/lenofezoxojimize.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/31b33gfudnmp52hpghj37eqoij/muzuserolo.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/lcp6132mbiiceqthek3n9otf18/20389216633.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/88888776054.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/80636637460.pdfIn PDF document text
    • http://iphysiology.ru/upload/detovef.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/0dbace141034221a470ed94b15e42de8/megigilapeg.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef6ac99a72---66293690853.pdfIn PDF document text
    • https://wolfgang-photography.com/userfiles/files/55806011526.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abceeb8aa1a---2710902615.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d716c2c317---podipibo.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/64161132926.pdfIn PDF document text
    • http://sdds.be/userfiles/file/xisubekigix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=history+of+sociology+powerpoint+outlinePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C90D 10784 bytes
SHA-256: 56ff5ea25021a15262c31ed98a2ab9d400f6a09bb95a2bf0615a4b284ee8bb58
font_01_sfnt_off0001e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E221 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001fa33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA33 19892 bytes
SHA-256: fbed3c2379c7f575c4edf4a3ebd773ba788fc3650718941e1118d0c916998cd9
font_03_sfnt_off00022b28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22B28 2180 bytes
SHA-256: 64b9a37233692215530a9ade6a0aca681b4bc6a997349d3230f36bcfe5731325

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