Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2ef46e5f5c1e55…

MALICIOUS

PDF

68.9 KB Created: 2021-09-29 02:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2015af2ec979f5bde15c411d2652fe44 SHA-1: 5510f7b6ee00fc4dfc5fb4eb9a51d8127bba3fdf SHA-256: cb2ef46e5f5c1e553e40dcbd4b82227fddb30225586ebfb6f10bfaa317052e8f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cructi.ru/uplcv?utm_term=asianet+news+live
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161357c9f222a2---36497367912.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dce5c528c4---71005148889.pdf
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/fixubajofidozejesa.pdf
    • http://inspeq.eu/public/files/bidizose.pdf
    • http://litho-and-co.fr/ckeditor/upload/files/59897755858.pdf
    • https://ecodiagnost.com/ckfinder/userfiles/files/45337311354.pdf
    • http://www.farmaciabergua.com/userfiles/files/12724716227.pdf
    • http://pevak.info/UserFiles/File/botilimaxi.pdf
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/38676247459.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/b5c9926b10f34ba34018674e66b4666f/rapipuzexabibawuxixevi.pdf
    • http://losangeles.songhakbbq.com/uploads/files/88299514853.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0b51db9db8bab937fd42e92b3569df93/wefarolixewodewulapowu.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/4d33f71d1b24db6634a96b60e71c7461/56713236939.pdf
    • http://andlupa.com/userfiles/file/1220342588.pdf
    • http://agierresrl.it/userfiles/files/60779533690.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/31097482331.pdf
    • http://studiomarcheluzzo.it/userfiles/files/sagulisojalodo.pdf
    • https://coopinproject.eu/ckfinder/userfiles/files/65727703602.pdf
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zogabeputimikeresizamak.pdf
    • http://huynhgiabaohotel.com/uploads/FCK/file/jufexekimibaj.pdf
    • https://khoahoc.timviec365.com/picturesfiles/4432671769.pdf
    • http://www.ntweac.edu.hk/admin/ckfinder/userfiles/files/64072954658.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/kodikokovaxab.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/f7688e231a4fc004cb97c3f90abbf98a/93282161849.pdf
    • http://csc010.com/userfiles/file/20210910192041_o2hv68.pdf
    • http://union-montage.pl/userfiles/file/risokiba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b22d.bin
ef056f9ddbd382bb812a40f67f11b4a9bd03d1c39b829214453d8c2e7ee83e62
pdf-font-stream PDF embedded font (sfnt) at offset 0xB22D 10016 bytes
font_01_sfnt_off0000c892.bin
c12427a0b5cc5c696cb26afe99bcdda923e20f241f4869a863ec7f27cd97c2a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC892 14972 bytes
font_02_sfnt_off0000ee6f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16792 bytes