Malicious PDF — malware analysis report

Static analysis result for SHA-256 46308a8ff87a6463…

MALICIOUS

PDF

72.1 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: 652332c9bc397988891e675097f9eacd SHA-1: c04705fd253f587417a9f9f5a4cd6e74baad5a00 SHA-256: 46308a8ff87a64638cfbd9d5a4b3bbfb0442417a75a63f5da968a72dab824361
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains embedded JavaScript, which is often used to execute malicious code or redirect users. Additionally, numerous URLs were extracted, many of which point to compromised CMS upload storage or are part of a link farm, suggesting an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_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
font_02_sfnt_off0000f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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