Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8426af30c8c71cb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-07 03:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b885f1aa95ed0a6994970703b3371eb SHA-1: cd69e00d9ac2db0536478b00d6e2634f6b081b8b SHA-256: b8426af30c8c71cb9eed6bf42f081b73edb3a95ba563e361327183c16e00897a
164 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and link farms, suggesting it's used to redirect users to potentially malicious sites. The primary function appears to be directing users to external content, likely for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=dengue+virus+pdf+2017 PDF link annotation
    • https://zifu-tech.com/app/webroot/userfiles/files/kedaw.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-1/20210901042811160397.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210715_E8073396827DCC0D.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/3f1200122c3885e3ef9699f8deccbf61/tekavom.pdfIn PDF document text
    • https://xn--bankkrtya-41a.hu/js/ckfinder/userfiles/files/jinozaliwinu.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/tnhvs4l2eh9hcpqufaksaoqbb5/sokubolaveb.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dacc05efea---39089297283.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/dexedenibegalapidabap.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/dopevuguwavajitasibo.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d8c37a0a5---88571768241.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/2183537723.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/bunefujosoneku.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/37914412569.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/nanvog2etqkh4ksb20jper1bct/38455465479.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/rebonipakedu.pdfIn PDF document text
    • http://webs123.com/userfiles/file/14209633109.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160aca230de618---17911687393.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/18386630682.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/fkh7qe7k7ftiqbsci7obp1koj1/lekavagekogonegiwoviz.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52c993f6b---mapobelasisudukimaxazeno.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/gapodutawabibaz.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cba2267ecc9---44101114935.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/sidopizoliwuxi.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/xinilaz.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_off0000d9f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F1 10760 bytes
SHA-256: 63254c65599ed8a8a200a520cfabb43f645fe3ddff34f5d86a7ecf59c47a0152
font_01_sfnt_off0000f2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C4 17504 bytes
SHA-256: ff26f0d9e40a1b9a48346d0bfdcbbbf4f211e09b5eedae4cc94e8f6852d055ef
font_02_sfnt_off00012067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12067 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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