Malicious PDF — malware analysis report

Static analysis result for SHA-256 b190a80480bd8dde…

MALICIOUS

PDF

95.7 KB Created: 2021-08-03 00:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e82fd90faf96590522124473a23b75ad SHA-1: a37b9f3af4ba725031eb1410ee4d79f505fd7531 SHA-256: b190a80480bd8dde9d5593a5fd6eba040e4d2fd49e731036178d23edfdc95119
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5818

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 https://realxenon.ru/uploads/files/tudowofaxis.pdf In PDF document text
    • https://oxi-dental.ro/imagini_ws/jotuxebijezebasaboloruxej.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7ab4dc085---61541073266.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1aee61553---47885401944.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7fb62fea9---18701893209.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///buvugitedofenino.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/47547882740.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f762973ec---51610245725.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160842597902c5---58226686223.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/63808092352.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756afb6cfed---wepofubikewa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16105adc57b9ff---62913183668.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zujufaliwafebuladevejufar.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tn1jrgs3qv0vu7fnd9rjqls78p/jaduzap.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16077b69fb0849---pobeb.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210620221153.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21095ba578---vebosaru.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/c4f11b557d1804e84f53cbb3c7f7ad35/galonavinuxigunubebiwaf.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/zasejagukofobaroze.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/52564224874.pdfIn PDF document text
    • http://mcutech.net/files/tizexepupizof.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/832d68bb57364911365e7c29e2b51331/55194785542.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6e734b089387e923f648f447da51171a/rutojasuw.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/23219157169.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/kufona.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/6df5565ce29a2e6826cf46a0727cedab/41691536404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=blaue+reiter+almanac+pdfPDF 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_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 16924 bytes
SHA-256: 885e44f49ad4136705a6bc0d4dbff9e436fb051acae17fc59ffe62716bff9cf6
font_01_sfnt_off00012eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000146cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146CC 10648 bytes
SHA-256: dac4210d7fd61afbf050dd5e7f0abf013411d40a4913af66215a84f0c486c1c0