Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb83d9d9eba6cc56…

MALICIOUS

PDF

65.1 KB Created: 2021-07-19 00:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b867c8acdd3e3d0204dfae5123a7f3c7 SHA-1: 8eafb01b4451ef023152f7f6ebeb8e66722ad43d SHA-256: fb83d9d9eba6cc568744a68631f081aa12d403f8e16b4d502e72339ff4033a5c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS uploads, suggesting an attempt to obscure the final destination or distribute payloads from various sources. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://uco-kampen.com/media/files/vubamusetuperoz.pdf In PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/0e6116b2e48e06dc71fc3f2f13bd63ce/3524527840.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/74721893605.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///97371816177.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c501c5a540f---9190779199.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/98560f4601f154f7278dd7369135cfda/96821617014.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/58305679114.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c25985a8---98746694416.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96abf1e3ad---sasukokogosam.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/53828659319.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/wonifuzuwewupejifijepo.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/xerenuwolezeka.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4d950f617---kefivobewisule.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0af442fdcccb6cdb2b6467085ee42dc0/vukatetuwumu.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a910073d13---73270756763.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/pelivegerivotibuzexotezuj.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/danewimemisak.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/pomorebevowivusoteremidez.pdfIn PDF document text
    • https://tsegypt.com/file/69933694271.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ece1ac9a---bajerekuwafalivagi.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/gunoliditujarugawuwe.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/537289add6a1a7af1a756bd9402af725/wamuduripazekawasoj.pdfIn PDF document text
    • https://la-klamm.org/Files/files/37483922794.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/87258438586.pdfIn PDF document text
    • http://swadeministries.com/pastor-sammy/upload/imagecontent/file/silibumamujam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=duncan+laurence+yetPDF 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_off0000bb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB1E 15672 bytes
SHA-256: c1c04948a0e03185c90dbcd19e8e739f966413b083202da2e7a9a0c70a98f4b6
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 10060 bytes
SHA-256: 567fed9f24cdca9a00c3dbf214efb8a375ea9fea3e3f315e070c9d55bd3f6bee