Malicious PDF — malware analysis report

Static analysis result for SHA-256 d238cbfb4990fdf9…

MALICIOUS

PDF

62.5 KB Created: 2021-09-02 04:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5d7505dfc071a4623daa9fd62d5a186e SHA-1: 3cd195d5feed512602c296bbbe594996573006c2 SHA-256: d238cbfb4990fdf9879e21101e388d47c230e9a6fbe1c2c2f05d28ab4e1f823a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it functions as a link farm to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9505

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/aced26be082487f81fc8368a1c5858cb/1508294227.pdf In PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c0278a550---27894304428.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/53362281213.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/16230e7047977ff6d86c8bb15fca63ce/wekesugarinupudolov.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608041447d547---puligabopujirilubujupine.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b76360656e6e36491d7c3eb81b59c537/fetijopogidu.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8aae6139---92618828536.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17535d925b---13783873119.pdfIn PDF document text
    • http://didula.com/img/file/23901639684.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/nivizazarod.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/gufumawijo.pdfIn PDF document text
    • https://egf.tw/test2/images/file/77386033017.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/71103037882.pdfIn PDF document text
    • http://4darchitecture.org/img/all/jirajuzal.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/rq06a2ad16p1h0qim0sfs7f89b/lolosafukunoxe.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/joganeretazomadawofa.pdfIn PDF document text
    • https://valenciamaids.com/userfiles/files/mokifazu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f29d32b0a55---womatinotalekugilinaf.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/56283823875.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/worokofumevan.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/63f53e93ce0d38034c03cfff55cc976a/35753034629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=summary+of+extremely+loud+and+incredibly+closePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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