Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d6cce565c5cd5c…

MALICIOUS

PDF

85.9 KB Created: 2021-09-02 06:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b66770a6a3f41511b0b2188bdd1c818 SHA-1: 050d4b35a1b5de094eb2282b8678a7039cea8e03 SHA-256: 81d6cce565c5cd5c0708318683f782fb761cc1e0575e02c09a722899a32d2b40
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting, suggesting an attempt to obscure the ultimate destination. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7825

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://psychologkmalinowska.pl/ckfinder/userfiles/files/40394630153.pdf In PDF document text
    • https://ihotel2b.com/upfiles/editor/files/wivopejovuwite.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/dgrajlg21snl8fkhh1h5sd8d60/dogaviwinovutu.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/lejatekeze.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/11852751783.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b787436545d---8146685039.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/rozawesatarewojitosifoweb.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kuperikegodil.pdfIn PDF document text
    • http://katachizu.com/img/news/files/67714777706.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/isr01phann2iah7l8o3s7qb61g/85481598106.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608511ea0814f---kafokimadub.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/af9849ce4f7b06ef7a425bed0d5e328e/95135729163.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/zujoxeg.pdfIn PDF document text
    • http://cabini.it/userfiles/files/14253051004.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f71fcfeb9fc59b0da4a00f6ee0b97734/fefudumojijoxesedo.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/leliv.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3474cb511---vijonez.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4878urf9ad2g418juetf3r3uk1/14477649999.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1b6e5ef67---kovazakizusalonoxaludomar.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021080701204180554.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/funifoxesojaraxinakik.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/fvkbler8n8slavb8kq3tkrjrme/97162370535.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe708d460---laradugokimasowilu.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/98245772396.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c66737ba11c---32444644220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=what+color+of+the+rainbow+has+the+longest+wavelengthPDF 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_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 10900 bytes
SHA-256: 6d3487acf05b9450b7ec4f1b50c671ca1f27058df054bfcfc54e8d7992e62985
font_01_sfnt_off00011840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11840 18636 bytes
SHA-256: bc2cffaef9eb5cc17b3db890a7fcb282bcc9ac5b8a8b3eec15e7c52ce9dd6eb9