Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebd9f925324e7602…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 02:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3cf698ad989a0f815a21d3e874d3898d SHA-1: 889967661530aa1d64d4517af4b47629e69cff89 SHA-256: ebd9f925324e7602a2855a8776c9c71c927f583d845e49563847b4c46d905af5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. This setup is commonly used to redirect users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

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://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/870e40dc20e283b4c57298d842e61b97/roteto.pdf In PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/popugasonowewalo.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161131238c4720---wofadenot.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb9238aa42c---jovabowoti.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/98700789099.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a2f169b0fcc888e0b0bd02a062a81d1c/dilesunogoposevudat.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/lojekukuwudilofewir.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/zumufabexezuvarex.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/77445863363.pdfIn PDF document text
    • http://warehousetraining.ie/images/29518120174.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/b3e396ed7c26759e28f8f9ef3909d86e/8143262774.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d516a388e6f39d5e9e110df755873529/zilaligosopitadugoje.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/dujesurademuzebuxevidu.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070f9b0e35a7---subisazulifofopuvoseda.pdfIn PDF document text
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/ed0tsr59l9g6c6g5r09gdftvgs/pewadusonopubalijivisuvij.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/metifimepomog.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/60007d92539ee006f40e8a7626d72e46/94120326274.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/dalepekukavaxap.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/d34e0c83ff97a6c4c5f0a2dbbdea55ed/warazisuzesow.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/76047431115.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/busuwulotedefiba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=magnetic+contactor+parts+and+function+pdfPDF 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_off0000ce86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 16688 bytes
SHA-256: 985ed20c391f995f547d84946a8cefe919da1d247c4debc4b613cb29b802eee7
font_02_sfnt_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 10840 bytes
SHA-256: e883b4fa3217a9300f39960ddc1729d02dfb78c2fffda6931e351ea39d2bde15

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