Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc168efa0ccfe9eb…

MALICIOUS

PDF

63.8 KB Created: 2021-09-04 08:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 984a083b17f8793603be6dc986b833ef SHA-1: bed321b311f6231743d7fa8e5779fd2dfdc4d261 SHA-256: cc168efa0ccfe9eb14cd48d20d968cf4d14ec4b22502f4e1d0fc31acdec1dc60
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting an attempt to leverage these sites for malicious distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5020

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 http://nessium.fr/userfiles/file/81204642630.pdf In PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/wefubugerafurolejajo.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/10278889727.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202108140809105823.pdfIn PDF document text
    • http://richfield1960.com/clients/865265/File/sugegixigerajolu.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/vorafe.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/31210658348.pdfIn PDF document text
    • http://exima.kr/userData/board/file/30716775434.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109f9ec9cd56---bugugerimem.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c23abb753f9---gowududapasaxez.pdfIn PDF document text
    • http://danfilenemd.com/clients/67744/File/4670232417.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/bijuwex.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5480a04420f9a4c70966cf0797b61eb4/bupekuximixu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e1d99a7f8---23609893986.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/42265120695.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/70pquf0d0r0ajj7k3hemmeunbk/jijigoxeg.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/94920847558.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/dijebe.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/ctv4vi1dnhcj6p0q0du03na8mt/39944396113.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa9f062ac9d---geteze.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/gn2med2rih57pgotubbfn1b5mr/nogiwuzogulewoxod.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/peloridumiva.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/87687455672.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/10773113448.pdfIn PDF document text
    • http://bacvietexpress.com/upload/userfiles/files/mifevu.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6e8aad47f---62977480911.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=free+math+worksheets+6th+grade+word+problemsPDF 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_off0000ba42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 11104 bytes
SHA-256: 50507cccb2e99d24ec07e0336422890d9bb17781333ccec040dc8753c61d8a69