Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9688cf424c2722…

MALICIOUS

PDF

93.0 KB Created: 2021-09-07 07:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 90b8eb659a3b4577e116a70070fdcd2f SHA-1: badeb456a34fea8f6f2ed6cbd2df6031242a84c8 SHA-256: ec9688cf424c2722fb3aef59e72b320e016257b1fc8b2ae5e4d49bcd98655847
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads, suggesting an attempt to obscure the final destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/51927299983.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/vikvijubsn1c1g7p4ve8qemig2/ragen.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/gabowegokajupiromu.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795debaa39d---zexukipuromiwaxepa.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/jofokimovu.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1610ab5dc1fad8---xepugimuvogobaxexopipajir.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/bopasofagolorozodibane.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/zukeno.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/b81b85af517677e603f7785221f5e304/29040190811.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb5434e553---47794499248.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/31149110179.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/23007217867.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b137d728277---49337741280.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021082612451183.pdfIn PDF document text
    • https://pomacanthe-art.fr/imagebeforeafter/files/lelisawiwunawetopenotu.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6ecf70c15a---46427020085.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/vizatujasuxavamefazuruk.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/7611354990.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/46085621352.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/wimefij.pdfIn PDF document text
    • https://kajariaadsevents.com/admin/uploads/file/56569142196.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c33bf341e8---39229941615.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ab6e4651c72439d80c2de0a44b05c28d/valazatugumev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=maritime+english+vocabulary+pdfPDF 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_off000102b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B8 18708 bytes
SHA-256: ac88f90b364d9b90a5c6e50769cbe5e3a048da92287cf3fb9e20c3d6387468b5
font_01_sfnt_off000133b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD0 11480 bytes
SHA-256: 20e4efe6b0b00b579ff80dffacec0e8af2a9d03a0a2df35f33f0a23ba80bcf5e

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