Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fb2bc3ce8cfa42…

MALICIOUS

PDF

56.8 KB Created: 2021-09-07 09:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 1025837c387d7b3ab1b465608618d0d2 SHA-1: 747ce4b36dce1ae8f039ed5a22a8373aa6c227cd SHA-256: 57fb2bc3ce8cfa42b051041fe29b653e907758df77b4252e2a716aeb5296ca92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8635

Heuristics 5

  • 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
  • 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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608090721590e---8343889012.pdf In PDF document text
    • http://hesexpo.com/img/editor/image/file/famusinilobawezatala.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/85715747961.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/4076123066.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/megijaxujado.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ea954be48---zatosibagalosonajo.pdfIn PDF document text
    • https://noventa.cz/media/files/file/toporebamiguwuje.pdfIn PDF document text
    • http://szwygs.com/upload/20598294457.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/dagigobejumudileteba.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tugefazujuximoz.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/139f9c9db416e0ff0fed545337d19ba9/letan.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/49026830981.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869807e4b22---86084362725.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607939bcaa1aa---27261649772.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c90a44086a---7838703326.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/redol.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/34621966966.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/birutatamarabinusapesi.pdfIn PDF document text
    • https://kleinimmobiliere.lu/userfiles/files/zewajonawufokewuz.pdfIn PDF document text
    • http://cochemical.com/upload/files/suroku.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dded460a2---9044483043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=synonyms+worksheet+3rd+grade+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB54E 11348 bytes
SHA-256: 052f2a604333a62f79d195ec9568ea8666bea48cc307d3c532cfcc9a80db114d
font_01_sfnt_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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