Malicious PDF — malware analysis report

Static analysis result for SHA-256 23571a45125740e0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 11:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 39de233aa9a2cae0f99aaf9d561006e8 SHA-1: c4e03ef4428ced51e630fa2fbe3e5de4f175c91a SHA-256: 23571a45125740e0a10dcb14ad34968bd5d55f11cf99e640b54f0e706039e420
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on compromised WordPress sites. This suggests the document is designed to act as a lure, directing users to potentially malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://wastran.ru/uplcv?utm_term=detective+conan+captured+in+her+eyes+full+movie PDF link annotation
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbcf2a9a68---kowigiwurejojomoxu.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/luvigofilosoj.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/xizigoletowigakibafafer.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/68956798012.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/82808174459.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca75fb002c---46076481563.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/7367029343.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/30007907804.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/38498716206.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/dilotigupamitomugoteboku.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/59858869069.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/18477673089.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/19178341258.pdfIn PDF document text
    • http://zl369.net/userfiles/file/xakavoguzifox.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/31756156648.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/91067804498.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/1716424839.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/b1e1d72feb17c0ce9f3476de9e3682ab/xatamororiwafidupurovig.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/22854550221.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/76484195970.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/bovupawawipiki.pdfIn PDF document text
    • https://theurbanthinktank.com/files/28633538141.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/todafen.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/51205884028.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 16148 bytes
SHA-256: b93828211329a31e65bb9b69119891ffc5f1ddfc642a0d75b38c0556400a3b56
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 11164 bytes
SHA-256: 155814c78d9afb92aaf62be329aae7dd25fac56221d474ab83e167dc410b7724
font_02_sfnt_off00011d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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