Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1e8ceb273bbb7f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-05 08:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e9570e292543df0f8cec22e2ef8a664 SHA-1: 399f349b7dd40064c1415997a72fd25d1eb016be SHA-256: ce1e8ceb273bbb7fd56bf3664a1c3fb38b7297f333db58b796f1a3d572a3fce5
236 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's content is designed to trick users into revealing sensitive information such as private keys or backup codes. This strongly suggests a phishing or credential harvesting attack. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2d450abffebfbdcc6091f95c477ffed6/menosumow.pdf In PDF document text
    • http://fratellilongoni.com/userfiles/files/23315209361.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/xagumal.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/5c18ca082930902b395f404713ee1572/sovewugov.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caecf368d2b---bidejuk.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f52bf0aebf---wiwetajoborul.pdfPDF link annotation
    • http://birnagarcollege.in/userfiles/file/fenufuxuwadanep.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161067747af334---jufidisovupesatipepoge.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/tedusef.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/27819154200.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/bugefegafodob.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/05f258f9562db24e63b35042cfc21b82/69142694976.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bff8f54db26---silokumidimekif.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/58430296742.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822fe71cfdc---90573439853.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/90578265251.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/76361515701.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/50b144da83c70ae11606a9b1fd335629/44905066731.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/c35bfa99c13d84b6f908d0906ab6caf9/gipireni.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b9414a7b---3401056540.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/4635acedf5b6341705b0d6760db3c97b/48549676012.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/88873195097.pdfIn PDF document text
    • http://asv-solnice.cz/_files/file/30566541686.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f45a786f59c---radizusawuvipagom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=night+world+strange+fate+%27pdf%27+free+downloadPDF 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_off0000dad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD3 10872 bytes
SHA-256: 9efa7243e3d81450c43e013cdb9fcd3254933d9dfb45f6d6c810d8cf535adf53
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 17676 bytes
SHA-256: eb4173115d0057d214caf64e8aadfa60bc50350a63298d9964f1e9986bb68b03

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