Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf6bc3b40f4a88b…

MALICIOUS

PDF

100.1 KB Created: 2021-08-30 13:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cc17eebc1986c17b91b0782322a68b4 SHA-1: fe346c4d2afa91b0a970eb855da0c6c7d1928de4 SHA-256: 1bf6bc3b40f4a88b0050c6ffe550ebddf59b3109dd1fd070568bcd4ebaad0997
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, directing users to multiple compromised or potentially malicious websites. The presence of numerous PDF files hosted on various domains suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4108

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://murtenhof.ch/userfiles/files/dugokonarajiwi.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac32f6b500e---vaxodivupof.pdfIn PDF document text
    • http://www.rotudavid.com/ckfinder/userfiles/files/87918090430.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c657a52d4fa---musekepelil.pdfIn PDF document text
    • https://5uempat.com/contents/files/34153047607.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/mafivo.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/76533547174.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/kukidemukujinipujujuzum.pdfIn PDF document text
    • https://zniczekowalczyk.com/user_images/file/45433003458.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079639fe816f---71543233998.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/meperisamixukomivo.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/fipokarerig.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/40918553311.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a152fa91cd---funefovugamilizozabenanuf.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b1e6628cf---maloxigizi.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/1310651288.pdfIn PDF document text
    • http://mdfgiare.com/upload/files/zumaxuwegenajisolepi.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/farexovabemaj.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107071849556971251ylbklyn5vnz.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/67993483016.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16089a03138c50---98808027873.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/medofegitilepemi.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/ruxukizumemotas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+sign+baby+in+aslPDF 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_off00013e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6F 10384 bytes
SHA-256: 9ce532305cdb70f21e51717f54f0efce15e2e470a828c756dadd04eec4fffce6
font_01_sfnt_off00015611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15611 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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