Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ee3a568b8197e0…

MALICIOUS

PDF

82.2 KB Created: 2021-09-08 03:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 996e24fa1999ffd2a2ccc7054f2f4bbd SHA-1: 93de814ccfbd2f4e566c5bf5ca37eb1eec5f9029 SHA-256: a9ee3a568b8197e03fbb9f9c8d310e9ea024287870f0323e08a9f6315b7363ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Multiple heuristics indicate the PDF is part of a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://dgjinhak.kr/DATA/upload/files/202109020720004877.pdf In PDF document text
    • http://inwama4.vn/webroot/img/files/40755238251.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210620_999C82D0F9BFB6D1.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/19169737897.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fc01b9256---fopanefuxemewotumuv.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/lidumekojizedeno.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/zevemuzurawevejegexorowo.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8afd06723---28350749309.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/32201744545.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf48a56309---newepo.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/69701331882.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210901_B6F3450172AD37BC.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/55612284298.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/2fe2e0a3061b7b56b280a6ac5e7fbc79/falamoxopujepi.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/jexifimotonagazike.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/fawar.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/kolapiwumiwijerabelexix.pdfIn PDF document text
    • http://195exim.com/datas/files/mokinadij.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/woxatebiw.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/05164f2fc53ee3fc28765b4425dfb290/lelene.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5100a4095---65539925518.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/21143a39d4aa59a99f970cf4f653b0aa/tanesidujolajivozenubi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16111501089139---78687906153.pdfIn PDF document text
    • https://bkht.vn/userfiles/file/luwofifefigetulatesemega.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/72691672752.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7063e963---sedojuranosadegenogixosap.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/zaxeximezinaxaxidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=free+creative+writing+worksheets+for+grade+3PDF 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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 11104 bytes
SHA-256: 5637444e79ec2598c2e4d5f1010c3352d473a77eab6bc174056ec249732cedef
font_01_sfnt_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 17976 bytes
SHA-256: b331aaa85b545cac5e8a245e6a869e16c9bb3f9eb0a38b068f06412f71bd1b8c
font_02_sfnt_off000121eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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