Malicious PDF — malware analysis report

Static analysis result for SHA-256 461bfa041df89bb9…

MALICIOUS

PDF

76.0 KB Created: 2021-07-12 16:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-24
MD5: 0b64eaef02fd96c713b57a9afe437376 SHA-1: 61b66e6a76711fdd3789f2b7609bbd26f122cc7f SHA-256: 461bfa041df89bb9f05f2a04fda9b4529df3f5b56af3a34706da6a857392fe57
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7920

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc4ea1714---kewavebejexuseduzaxuji.pdf In PDF document text
    • http://bscartridge.com/pic/6391838599.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2a6c1b7261---narolopajozegisabiz.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3c9d56d7bdecff979d914660548adc42/28556154536.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/wafagodud.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/74249171356.pdfIn PDF document text
    • https://digireg.sk/upload/savigejirone.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160769923475f4---faradonike.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9808bfa34---kilujaxiwovododobuwarini.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cf4532217---87103450754.pdfIn PDF document text
    • http://newmob.it/userfiles/files/41939076649.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dbea8950c5a---89917039876.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cf69d7b92---22641275495.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/15904f0669c8676c9a5272d703e41ba1/23617268566.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789afa8b042---23101714721.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/10569520753.pdfIn PDF document text
    • https://area5srl.it/file/furinalo.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/5506542872.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/60389696020.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/94550752372.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/ruvidokikim.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756cbc8acd---68038570584.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75b1c4e4e6---mimabufawazamixivuwaval.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/e05c4d8a2814a0df33763de8a42c48bd/17084918852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dehydration+cause+rapid+heart+ratePDF 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_off0000f1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C6 16480 bytes
SHA-256: a9b8961d2c950a4b8eed097566e82c4728390a3222d37793f2fc8054eb3d3e36
font_01_sfnt_off00011ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA1 10780 bytes
SHA-256: ef9b83942000ecfcd1fc1f2fd5e6f14cd716389474bbd7145bf788712d54601e