Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c96e30cad9b6e41…

MALICIOUS

PDF

106.3 KB Created: 2021-08-10 14:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9fbaf78c8c7216fe263027ce34e7ba03 SHA-1: 4352e4bfdea4cc9bfcb0fcca22f2310d93a61429 SHA-256: 3c96e30cad9b6e41772d3b99ac664164a41f2daa6d5c8ad5ad72d3cc425bebe1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised CMS upload storage and disposable hosting, suggests it's designed to redirect users to phishing or malware distribution sites. The primary attack pattern involves exploiting user trust through a malicious document, likely delivered via spearphishing, to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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 https://cructi.ru/uplcv?utm_term=ensayos+sobre+la+problematica+curricular PDF link annotation
    • https://skvely-kup.cz/files/file/zijikulogerumagupaduwokez.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/3lna6gc8rrp008j7e2omue84u8/dazubevesim.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/xebafigumotofubilavabo.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/lotosakanilake.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c15c15104---21596940520.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/dibidejisitiferomatupedu.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/99130753944.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/35488834794.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/17577492298.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608666d3156dd---18226594829.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa1ee2c---semebiditirom.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2286c2f6de---59843753990.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b5948eb7b4e---13423017724.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/0ab0afdaeb7e65bf1ab7d3faa21d64db/xepoxedawototodogutasoni.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aecd1722c3e---tumivef.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/glo045pss7tr1kcd1qhcja68ko/tuzenedowik.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c8d614747---momome.pdfIn PDF document text
    • http://canvangdientu.com/images/file/36445001243.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/xipelatekaduvuw.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/24668295984.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16085bcb9cf952---lonuxusog.pdfIn PDF document text
    • 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_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8C 18848 bytes
SHA-256: e42aaf8faeeb5ac0a2889f719f5b5fe6af6bc3475d5524a5e83e984d659c17df
font_02_sfnt_off00017fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17FB4 10872 bytes
SHA-256: 252b633f0a4baeb63fdfe65c280239f75fecbfde729ed20f76d49c460390a760

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