Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87572ecc0228d5b…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 03:18:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d274c58cb114fb58a207dc1cfe1c4732 SHA-1: e66b9bbe2f6a5a62f677a24633271da2d658c184 SHA-256: c87572ecc0228d5bb2193cc8a4ca8eef04c8a22c8040a22a41d5f4442fe1833d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable domains, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://goldenagegroup.vip/userfiles/file/46336875156.pdf In PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/fupewabuxekikibewovumomu.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/kumaw.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903115810.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/98394675991.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210901_09510214660551DC.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/52962625162.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/de506bb8587b98f7674f4709a78a5d26/25855071627.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/99326761203.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/elb8lo61iop2kjm299cr4bn51s/gunubokemaviwelejijowij.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/38584603084.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/b83fb403d53247ce137b7001c6112d62/merakiluwimesadejetezaw.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/bewefagudaxo.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/zezowewoxizidixiwulabifi.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/53587741412.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gurebojojawozitagogenan.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b6604e4c---bogijivapogaturi.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/62401081215.pdfIn PDF document text
    • https://rosanaalvarracin.com/userfiles/file/famuziruxokavuper.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/lunilabuxapoden.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/28680431105.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161396dd3d75cd---letagom.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/duvoweferop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=nfs+hot+pursuit+download+apkPDF 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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 10720 bytes
SHA-256: fceb68b6d2cd9a694572d6af2a21d42f880adf00cc51a564bc1ed712fb2642bf
font_01_sfnt_off0000ca48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e25a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25A 14264 bytes
SHA-256: e76aec30f296595e00eefa96ea43b15bd9ade4ceef7ff90b01a489dc2f9008f8