Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd15cc35a5695aaf…

MALICIOUS

PDF

79.5 KB Created: 2021-09-09 01:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f123d11143360ba7af149c889ba144d4 SHA-1: 622aab78b368166a7e2765aa81f22e3501da86a1 SHA-256: dd15cc35a5695aafdde11470fdb20b25e3de4244d8c96e57b61bdd538a168d49
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=obb+pixel+gun+3d PDF link annotation
    • http://mdknoodles.co/uploads/files/15980423051.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3c4db2a1528ae3881d020f669f77de18/36150542429.pdfIn PDF document text
    • http://mavelikaradiocese.org/rapha/ckfinder/userfiles/files/murupilepew.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210909031102.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/29556507849.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/zevofofelezepawis.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/dizolijodafijajefejux.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/16338433130.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613918b6d60a5---kituzewixiwamefegimarubu.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/xixavuxunesituxi.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/tamimiviwevevufativ.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/bikakozewasiseso.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16138faa925193---43887770572.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/guwofixuzu.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613336caf05be---woxezumisi.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/8vf4rc9ndvuhl8mbkrnaa12ue9/lujazudofuduridagunopo.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fegigowif.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/83082178055.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/88415297404.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/79971652761.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/32473439739.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/93791970382.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/lepusawoxawaliboluvapama.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/89303251269.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_off0000d486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD486 17712 bytes
SHA-256: 0f5206dfc03ce827942c8bd124580dfe11f9b05a15f370b00a2e43e02f9bb482
font_01_sfnt_off000100ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 10460 bytes
SHA-256: efb13656af43da2ac89af4fa01652f8b9000a5bf44fab7a63736776913488c4e