Malicious PDF — malware analysis report

Static analysis result for SHA-256 16608b471f89cdf0…

MALICIOUS

PDF

80.9 KB Created: 2021-08-19 14:36:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e701953c5df61948bcdd0f8254646dc5 SHA-1: 99b282d6afa928728813a48f9192387a4ae7a933 SHA-256: 16608b471f89cdf0ba5768882be6d86771527d43d0e3eb9bf420f4a1b591e4a6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm and impersonates Microsoft to phish for credentials, directing users to download potentially harmful files from compromised WordPress sites and other domains. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+minecraft+java+edition+account+for+free.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.lire-les-notes.com/ckfinder/userfiles/files/nutezenimudovesokanul.pdf In PDF document text
    • https://orrizon.ru/images/file/nezezuguwaloxam.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/ae0c69d93e00d729385833323584177f/70674568864.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/lm8cteobqg2c6su6rf37kfouk2/vusejinefesa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tulozonevopiwasup.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/29555995068.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160832c236cb5a---58958282492.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440c36f670---45329965419.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/vipatodu.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fab62aef4---41630969323.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/47865346426.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/nehsvqesqrnmj5q802fp6odrl7/mogigugewanemaguf.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089c6a7db919---94866964066.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760fe4e6b9---jobudinexu.pdfIn PDF document text
    • http://normel.org/files/upload/file/zewakulogixajinirunibof.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160758a20c1000---14373601206.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tepumazutav.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86c45b19b9---bukusadubewamolilaribid.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b9f743c1d---rasaduxumukoped.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/fobomoxetasipoxu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bef9519c156---bumuzinuwemasivupafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+minecraft+java+edition+account+for+freePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c2ac1bfb---radajajiruv.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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 16772 bytes
SHA-256: 5f4af6e577d2a1188fb71a018800ed50df795ef724e2f0738c80c9f2325f9096
font_01_sfnt_off00010545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5C 10976 bytes
SHA-256: c696e3c76fcfafa0fa0acc71a0f493f0020cf7b8337cf118084b23b477a6b87f

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