Malicious PDF — malware analysis report

Static analysis result for SHA-256 990aec5ad6f0bfc4…

MALICIOUS

PDF

82.3 KB Created: 2021-07-02 03:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: c79f8b98486b66d96dbad9b74001f38f SHA-1: 0afe7cbce1f9bb624543fef6287780323507a697 SHA-256: 990aec5ad6f0bfc4c71de6b7d4496aed64b0256ce41e0b2b8ac67ee6726dde35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites. The primary function appears to be redirecting users to potentially malicious content hosted on these compromised sites, as indicated by the ClamAV detection and ML classifier flagging it as malicious. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5d0bb1cce---53039291890.pdf In PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607835faaefd5---40461488535.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/26510504297.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609beeff4fff7---45005356867.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/cd4348454a560d41371275c0dc58998d/77970658356.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/25378e7db7cfff661aec2cd255fa5f55/zerofatafel.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be8ac0e9a8---70723312069.pdfIn PDF document text
    • http://apvn.info/userfiles/file/gugaxolojes.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acfcd6597bf---puvofas.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d500795eb7d---genivisajokawidemogijoko.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/iib9m44k331ambj749284u2lj3/24785683991.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fe9193c4---gibuboxatada.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/kitisoxij.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/wejakuvikifotu.pdfIn PDF document text
    • http://strandedtattoo.net/file/85202791272.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/88bbe971fd58d3d6e0f49e92f388e657/10739220471.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/rodizuruz.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4819cea9d---12710418948.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/gajosos.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ff8e0ce---57203256632.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/821eb08435757de9bf306595c9f03867/27436326265.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/nogakebagewab.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a3828b7a0ad5dadb21d9699956638f61/vudowodimavo.pdfIn PDF document text
    • http://www.moyekolodin.com/files/66253885578.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/24977536566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=ocean+view+stateroom+with+balcony+guaranteePDF 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_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 16848 bytes
SHA-256: 1925468c56ceef484483f4d0be6cbffe4df961dad94d4b1136318096cfd5374f
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12138 11208 bytes
SHA-256: a4faea6b1121ec0778faf977f44c7db79b60fa6aec355d6b36d86019256a615e

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