Malicious PDF — malware analysis report

Static analysis result for SHA-256 594b2a487bcaaf9d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-09 00:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 098b770918ff5caa02df55b283e748c2 SHA-1: 81474e43ab73d60233a2e9b6fd01e2639ac71814 SHA-256: 594b2a487bcaaf9d3e62e9bdac1fe5b867e30c0293822c6421f0196835f9066e
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/0hu2eq9oq5f7lq6ucggfrei510/werebogofufa.pdf In PDF document text
    • http://moto-bike.pl/userfiles/file/daganuvugebema.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vetow.pdfIn PDF document text
    • https://architektor.ru/uploads/file/15477466921.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/pabadavemixesakus.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd806a788---65394800142.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161383b0fead20---xazakorelewefuvogajijizu.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/vipekawaxor.pdfIn PDF document text
    • http://myagreement.com/UserFiles/file/gorijavumevutebu.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/11072464037.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/jifavomewafevilojugezidu.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/14111004907.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/divenunu.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/81338180615.pdfIn PDF document text
    • http://budka39.ru/files/86691207247.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109021812109706.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/81601839232.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/murutidekerir.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/55120353012.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/44009497051.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/welovifor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=android+music+gamesPDF 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_off0000e768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE768 10648 bytes
SHA-256: b0c8a4119313c52773032675c8bbc040587b41786d3b2c56ede8a3f8f9cc28f0
font_01_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 17912 bytes
SHA-256: 1b29d99e0a6b1b66f7cb77ec55a3a008c6c1b5e5c1081d9dcdf670e49115b92d
font_02_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1