Malicious PDF — malware analysis report

Static analysis result for SHA-256 c473d532dcc34354…

MALICIOUS

PDF

71.0 KB Created: 2021-09-23 16:17:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 252ab4d75195fd644001bc15b08691f4 SHA-1: 13a6052e7d12cf1fcf765d0ead881a47bb3b05c0 SHA-256: c473d532dcc34354aa79213c9f7905dbe37b14fe2cf93b5b5f16f508d69647a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The sample also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, some of which are hosted on compromised CMS upload storage. This suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://associatedreclaimed.com/userfiles/files/juzumedobusigavuwepexod.pdf In PDF document text
    • http://vividconcept.in/userfiles/file/bagoko.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kawudelikewotazaposoto.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/binikavidajoxipefusiluj.pdfIn PDF document text
    • http://eichler-kammerer.de/lunikosonuwowasilokesuxa.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/nofizagovaj.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/a950e6ae0acec66fe80419586569b617/78186985050.pdfIn PDF document text
    • https://eslms.com/userfiles/file/51157802655.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/xomifotepobina.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/8919860254.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/91071483031.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/36652597440.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16140f03270944---najijopaf.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/48831613975.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/xeravejavax.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/sofena.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2f0cc07c9---15421436062.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/rcpqc6ljiohjng7pfuk47e3tmq/mivotosatizipakurul.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/69667664434.pdfIn PDF document text
    • https://memorybg.net/app/templates/js/ckfinder/userfiles/files/tobutirezawamiw.pdfIn PDF document text
    • http://sbcnepal.com/images/file/67439037753.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/95978322644.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=chromecast+video+quality+settings+androidPDF 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_off0000b536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB536 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD4D 11272 bytes
SHA-256: ff9b7e6098cbfb8cfc730532b0c86d97ea1c8b83df62574884a4d0afa738e11c
font_02_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 15524 bytes
SHA-256: 8536c875cca280638c248b8003007f17f0990488bacac63b81a0dd381d00244d

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