Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaea4ecc076bb679…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 18:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 72609641394601d10aae89c18a82eb78 SHA-1: 678ca5170840be6327efb95c659b98a11ef63b72 SHA-256: eaea4ecc076bb679a0650cb76f9a4a26f829818ee9844e7b89c4682b0803b1cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document impersonates a cloud document sharing service, a common lure for phishing attacks. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/2ed7e844f61c47f7e0fd8b1647842e16/31314926715.pdf In PDF document text
    • https://parklanehotel.asia/userfiles/file/65489301952.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/gutavikizumafinulisinid.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/13422179781.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef61c641a---53072000295.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e02dbc1600aed0195a636908b2c0e9df/dibomixigepududida.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/af647c7c6f75604f295039242d634c5e/wejajigevusejanisez.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/gudekob.pdfIn PDF document text
    • http://rcot.by/pics/files/bemive.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/55654567068.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/1865320058.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/zukunitufuw.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/jojonaliwalidisuxowobis.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7df743031---faturezinonege.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/74777752019.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/35727726344.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nowoge.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d60450bd8a4af3c883af020f78715433/54149708055.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610893776cb88---26242733941.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/lowuwogulep.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/selikemetejigor.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/miwowaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=convert+pdf+to+copyable+textPDF 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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 10808 bytes
SHA-256: b370b84001b583315fa36b44c337e285b1bb4fbaea50cac7e43b67864fb24c98
font_01_sfnt_off0000f427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF427 17084 bytes
SHA-256: 735f581d2789b6210825694e89677bcdfee39fad8cc7c855d1d1cf985c9b0708
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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