Malicious PDF — malware analysis report

Static analysis result for SHA-256 8287accf6c549e1a…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 05:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10f6accd08417d00cae53930e9e105ca SHA-1: ae576d7d26da46fc8f581a6bcd8f97cd8faa3134 SHA-256: 8287accf6c549e1a659a290db7eb13cff7ae1645b8e5eeeeb56ba0efea2e685e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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.
  • 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://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/a3r0h8p7hbh4ak1eo02f3vk6jo/senazela.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2fc7344837---68439441239.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/wedudoxepaxiror.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/48586505029.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd7e2da50f---xadadusat.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a78b7da35---zawesirugap.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/i8vmeu0045pipcsvc6prth1t6c/44787808441.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/92540687939.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2ac6221213---kuker.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/xelevewopabukapodikuna.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/jedarinetesowofijokefu.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/ea6280af10f2190c1b8d7a7054164341/53546824278.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/93153831365.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/0b55f1dbc7072fd10b5132e04470eeb2/besazikitunosizenugar.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/25873679346.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e4d8aff5d---31830698884.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/52291cf17bc34b164104d1e64c78d3ab/vigaligopekuraxulafonefim.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/murusifedesipatabolabewe.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/felamivudadikenegekog.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/sbnndf3a0str2e8cgvkggafe2g/57585699087.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/mikebekinupiwoxasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=convert+pdf+image+to+excel+free+downloadPDF 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_off0000ca5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5D 17688 bytes
SHA-256: 38f21dbd5aa5c8da3304a5579c2aab82893b2b71fb55ae60ccf2eb422b87e38e
font_01_sfnt_off0000f7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 11080 bytes
SHA-256: c9a9d8e0c189bd98902de92bca676cc2c2ccd58e6ccd64b78a45a653b9abc2c8

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