Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1972bac0f61853f…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 05:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c4242a2cf8406b9fe86b0a79b4333318 SHA-1: c1ad35e3451da1c54e453be48ffd824b416a9061 SHA-256: a1972bac0f61853fb3238d1f0afbc4fc0203744e28b14df6b9abefe347c751f8
154 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves luring users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8975

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://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/dujuxadibaxa.pdf In PDF document text
    • https://betenenergy.com/sites/default/files/file/67571523003.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/bemamodolefojolitukegi.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/rajikozexebuserisef.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/woleb.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607402f336b05---wulezutomezali.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/wibetokefumudinunan.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/bukovuj.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/guxigijirevifumozoje.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1624a04a2---koparebogiro.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/42141651668.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mojipukizawanewizuz.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/jifebepelixedolejinan.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe4123de586---junem.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b66b2fcba76---44494449299.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/23608051042.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/96b3b42b880d1e50a36bca6a20e2b553/33153476468.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/jegunowivu.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/gikutotisupilum.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d09430fc67---43565605201.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8edb1b565de3d33200dd43b79bab4c1c/32071423955.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e965b620e96---rekivubojonokumipu.pdfIn PDF document text
    • http://mosjob.ru/images/file/40478997545.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f2f2fb433a1804127e64c12efdacd779/48594000873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=describe+the+transport+of+oxygen+and+carbon+dioxidePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 11212 bytes
SHA-256: e51f0e554b1a4e917286a905971b3a4f181e912d5204cd383565104b0a7a4e76
font_01_sfnt_off0000e0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 16936 bytes
SHA-256: 297ddf790d3b99cf4631b71bc6e7e7dcf9d9c2222e05258f645304d6169bb1d0
font_02_sfnt_off00010b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1