Malicious PDF — malware analysis report

Static analysis result for SHA-256 887bddf8ecd6a2cf…

MALICIOUS

PDF

70.7 KB Created: 2021-09-15 21:38:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1b37f430b0b7ff926fdf2da5dd6f0c3d SHA-1: 3677455f21e617fec69a740055a48f08e82f17f4 SHA-256: 887bddf8ecd6a2cfd1edaa2ab22446b1f661eaebeeac01032ea59b56bb86337e
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains. The ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggests a phishing or trojan distribution intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates that the document's primary purpose is to host a collection of links, likely to lure users into clicking on malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4393

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 https://tabularasa.lv/sites/tabularasa/uploads/documents/files/fopadapovurabuzarusevelag.pdf In PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/zuginifudisibuzoja.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/ibs328uu4ce3jt4jjngf6m7ukt/rafomezugusefusabur.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/litobexizemelokirud.pdfIn PDF document text
    • http://homeopathyhk.com/files/fosubotigofiloguw.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/fopuwuponenirezemaxes.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/goxunu.pdfIn PDF document text
    • http://melodylavernebettencourt.com/media/file/motozelanok.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/89037967905.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/56256248963.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/filid.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8tf6ib65427v5uo79ibcc8b2u0/44879710293.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/jeneruzijosum.pdfIn PDF document text
    • https://mcsfood.com/images/file/manaxemuvirezugut.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/lukeranexaxibuxoketigige.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/nanipi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408046c78dd---26111528036.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/64515679675.pdfIn PDF document text
    • http://xhzhengli.com/upload/pumumuvugapifofumasemisuv.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/1031015162.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/67476435171.pdfIn PDF document text
    • http://rem-proekt.com/f/file/rowegijusupolijur.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210908052955_744517659.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=lottie+animation+listenerPDF 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_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97E 10224 bytes
SHA-256: 184ef1f742775667f6a8c6c7f9ca2f17729d36bac993f1d2e72e326c585c4255

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