Malicious PDF — malware analysis report

Static analysis result for SHA-256 2739e702a7c94542…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 07:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c632465845f34c74f1e7103ad26ec492 SHA-1: 830b95b8f3e24e7dd5d029b7c12319ebd8d9aa8f SHA-256: 2739e702a7c94542a19f467e21e5d81901c5ae104fd4d2322193916695bfc5d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/d5945889c57c9f6f7e5d5d431a6739ac/29876964521.pdf In PDF document text
    • http://budoprojekt.eu/obrazy/file/damonarozavodumazafagezok.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160c2571f03872---4288477610.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/90653709228.pdfIn PDF document text
    • https://aedwea.com/upload/foto/rizusi.pdfIn PDF document text
    • http://medica-brno.com/files/82081210711.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/78377362472.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/831b2171b6f1ac332efd487d586e93b6/pomaluzepano.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/75920725856.pdfIn PDF document text
    • http://tebsc.com/clients/84181/File/ralopo.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/reduzenosexeze.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/zevukobipozeguzet.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607841c297838---58377832385.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/2ggnk6utuvas4bo4796c6sqcjm/xuvem.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/kunipogejire.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/22534c0b1232a371430313378acd447b/61433269730.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7bcab9b2083917985653d81b1ec1b84e/86898317611.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161201c4dbcfe8---19693328409.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4d223dbd8---60537680902.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c868068a83d---3795291520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=food+fermentation+and+microorganisms+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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 18084 bytes
SHA-256: f0ff85e8a5e1e68062b72d814ddce7e6490abf1f03c8ddf475a5bf59806365b2
font_01_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 10892 bytes
SHA-256: ca7cddb07c630777322ba6e8858ade44ed55d3033f8c26c557520ea7d0451e27
font_02_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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