Malicious PDF — malware analysis report

Static analysis result for SHA-256 f25f900bcc882742…

MALICIOUS

PDF

90.5 KB Created: 2021-08-08 09:52:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a681ecabf0f378a2e9dfebbf1822af0a SHA-1: ef48b372fa4157d2cd1634235687b85d3ecd049e SHA-256: f25f900bcc8827421f2c92a85ef6da3bff5e9de9f48bf71591edb8ed9df26bd6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://chcial.ru/uplcv?utm_term=audi+a3+sportback+e-tron+2020+dimensions PDF link annotation
    • http://camonetinternational.com/files/file/bakixipuniparisumibup.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c8fe1e1157e31ca08c6ee199a83e1be6/mesuzasinabatonawar.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/328295925d3f1b04d43a114f288e6568/nixofonawetogizabapu.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/33172931720.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/101cfb42cc04b9547862cc06f861d868/59676262986.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/xifoxetixebukudirodib.pdfIn PDF document text
    • https://energooptima.hu/upload/File/vomawow.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/kapifepegi.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2aede920f---didipirixunexe.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/44890878392.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094039a5bb9b---64444021827.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160844378a20d2---76147214634.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/rerojojapobakuwunap.pdfIn PDF document text
    • http://derma-dts.de/files/file/komegunovodixofuzobif.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/10510724872.pdfIn PDF document text
    • https://petikdaun.com/contents//files/31933388392.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091371a5caca---83512208452.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/zagogaxuboxoro.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4eb17db425---36036408196.pdfIn PDF document text
    • http://krossinkeuka.org/clients/c/c6/c64aa726effa6776341672ea469011e7/File/73639203910.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/e21930dc9629318999a969271713d380/dubexorigegixiburi.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/zuximi.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_off0000f92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92F 11392 bytes
SHA-256: 6444c207d4ad79619f11907f149ba69ca1013b8f1d0b1de570fb212730d63bf1
font_01_sfnt_off000113f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F5 17900 bytes
SHA-256: 315f1e88cb6d6c55a658eda39e2171cb57a0b61f4a5f7b45beebf8fc5e01900a
font_02_sfnt_off0001435f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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