Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d110ab8731d0657…

MALICIOUS

PDF

71.9 KB Created: 2021-09-07 14:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0ff150148498c1ce52ac1ac210e09c6f SHA-1: 25e4f54c49e80e8ebb7f477af9cccd243fce2bb1 SHA-256: 2d110ab8731d065783d7da955ecba97cd54435c217bfbdc9f00fd31aa0fb6bfb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm on compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8398

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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743415718bd---bupifag.pdf In PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/89062401128.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52b271f6f7---davurizevexinejutoxebup.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/g2k4g20g0qlauvn7mg5f6pgvi0/97260324845.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/25bfd165077088e182d86e359b806009/juwelanulisowirejibe.pdfIn PDF document text
    • https://hgb.se/filer/file/zoteneguxagolefuno.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/farovovelafitepexe.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/hbgko5k5nhdum4v0lso045in60/48319743728.pdfIn PDF document text
    • http://semineebrasov.ro/printuri-fi/files/basowevejegapunop.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/rikigegepiv.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610ef8926c0e9---98780566747.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210609071213.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/f5a7a57cc6879a0edd6966be6e730920/58126102559.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/8557316411.pdfIn PDF document text
    • https://oversaslogistica.it/file/3953736129.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094d558232b7---suvenit.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada7736e924---rasopag.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/26112836277.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/11798178329.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1572324d85f94d3cee7406f624703fda/zojalipi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55890f0042---kurumigososozu.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/pap4ltmqpcutsneclmu6asitla/tepunodakujefemajixe.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b71bf2c2b---gunomiduxanozo.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07cf126b88---nijugemaguwa.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d2b5f6401e781a2cee1beb52db669a03/86664506382.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1b672453c3c60518c5c27e0de60d7491/tipenalulufakumagafenam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=pentagon+papers+summary+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FE 17556 bytes
SHA-256: 492245862a61b10b3a1991a206d8c3cee0670f96816018b8de63f1d17ea19270