Malicious PDF — malware analysis report

Static analysis result for SHA-256 d03dc36b49c006eb…

MALICIOUS

PDF

216.7 KB Created: 2021-06-15 18:24:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 88deec4dee94dc565f024177c86b6aba SHA-1: 6adb7f573dcb619db34a9813a7f79859d216409f SHA-256: d03dc36b49c006ebe87ae9be99da15ef55ed0f8d82be3d524b3639e9aad2fb36
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, likely intended to host and distribute further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest a downloader or redirector functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=accomplishment+report+sample+for+nurses PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad2fac161---31428536012.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021051602471570.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/71ns06dvipiobj5kb59mvig5q3/zisunorigezulefosir.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f4600a53f1057fc609d799deff70d1a9/83097878852.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/75451271414.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2057a5ba6---41297120152.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/4jl4an782q72q77afuhfgf8b75/72742396029.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b36c006a5e---wojoviwaz.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/50c709bcbb60ca30745254f176388d47/dipanavuxovuxevepomup.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed71cf024e---sofedal.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c50e024bd---fopobesem.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd8945af32---biwenelovafa.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/kivitozolevebemeguxolapef.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ba0295bf2d8e0e8f9020471cd1c9e96a/38477270029.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8c5487b74228f6f54441712a6a89d2e9/83940307125.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0003220c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3220C 5244 bytes
SHA-256: 1153beb8fa20525f08759bf8000aec72c191321d7a31cd15fcc304be55b26baa
font_01_sfnt_off000333b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x333B8 11828 bytes
SHA-256: f7349340c74f1dc625e05b5d13d9afaf8a8b699a7a294b7c888f9e58e3287ec5

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