Malicious PDF — malware analysis report

Static analysis result for SHA-256 748317ab5b065f9b…

MALICIOUS

PDF

104.4 KB Created: 2021-09-16 05:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6da4c916bc86ed373a245046b12c6e81 SHA-1: 266224577b9e5e1b4964874caadb4add6985b1ac SHA-256: 748317ab5b065f9ba0490d0733bf5b284314c428396b1443bd89fe76b6236430
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=android+virenprogramme+test PDF link annotation
    • https://holcom-wd.com/webroot/img/files/totetoje.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8504da9c4---2283571793.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/zemasokap.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aaaee7cf5---piluwukixudukirunan.pdfIn PDF document text
    • http://saktigroup.in/uploads/14922089772.pdfIn PDF document text
    • http://vitajeans.com/ckfinder/userfiles/files/78809454343.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/4c72ecc7828c25e9a7504c0997ed2ff0/pesikafa.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ddb2225756---29953454824.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133d4c79cbdd---86485826861.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/pusojobojagawafizap.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/13229957357.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/fefemumafolutixilava.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/6c90d73377c10f7dc7ca8efc25090394/86646990281.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/13799255041.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/15136345400.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396c85e8d8---56975544436.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/tujipizit.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/jebofobibujidovalu.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613829b96e9f0---15068493335.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/rubut.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/81393551314.pdfIn PDF document text
    • https://koratspring.com/upload/file/dolorekow.pdfIn PDF document text
    • 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_off0001319b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319B 10736 bytes
SHA-256: 88889eb85b4b826a9a3dcd8ee6700cc56bf23b037d594b000683e42fbd74b102
font_01_sfnt_off00014a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A16 19020 bytes
SHA-256: ffefd15842e2c371ea917e65d1a157037a6e6b3c7463759466d07eb862361ee5
font_02_sfnt_off00017b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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