Malicious PDF — malware analysis report

Static analysis result for SHA-256 34838a6403e54e5b…

MALICIOUS

PDF

77.7 KB Created: 2021-09-09 13:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 11d7d7a0bba8d1419236851838fe9474 SHA-1: d342255dfd35f192f6b207172e2e5ce2806d6c72 SHA-256: 34838a6403e54e5b6755e5603e670f9f5aed7527b2b49a0ce77812efdbb4a2ff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of numerous external URIs, including a link farm pointing to compromised WordPress uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=tom+hero+apk+download PDF link annotation
    • https://szelvedojavitasmiskolc.hu/files/files/80385766621.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/lijisegite.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/5824df9aaff0893ac77e2dd7d67d5887/xegugubowamorar.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/nekolefodob.pdfIn PDF document text
    • http://dsraxys.com/uploads/vatilaxuwuzelujunejufupi.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613337a257c0b---posudorej.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337f2d0bd47---18124360293.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/61707590702.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/40073571335.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/disaruxobuluwupesenavo.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/54492942649.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/48037704715.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/15182647190.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210908_BAFE19EAE9E3EE97.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/39a4b1ab0aebe37213a851b5d2d313d1/dunudetuketow.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/biwukorenavu.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/76380461788.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/kitolelofejokuzo.pdfIn PDF document text
    • http://inica.org/files/file///tejovone.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139d362c185a---romufeda.pdfIn PDF document text
    • https://predial-rua-nova.pt/056-CovadaLua/images-editor/file/7409182539.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/88528006227.pdfIn PDF document text
    • http://thaide.org/userfiles/file/60641795366.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/53091244263.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_off0000cf05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF05 16564 bytes
SHA-256: fa62733b4f5e11df2a86ac91da15332a34363f347e0e36189d72bed5c13aacc3
font_01_sfnt_off0000f99c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99C 10440 bytes
SHA-256: d8ae63dccaf78bc9c4b550e07f36ffd214adaea2767489e903b3efa1ffa7e562
font_02_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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