Malicious PDF — malware analysis report

Static analysis result for SHA-256 c804396014049d83…

MALICIOUS

PDF

75.2 KB Created: 2021-06-06 13:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 333ab8e9c6bc6cbbd5fb75b53717032d SHA-1: e617bab12b21271f75037455b3f1460181f4d556 SHA-256: c804396014049d835b52848d79533b0e82e340641d208f4d0eecb5613dc5feb3
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially compromised websites, suggesting a link farm or phishing lure. The presence of a 'download button' heuristic further supports a malicious workflow. ClamAV detection and ML classification strongly indicate this PDF is malicious, likely serving as a phishing document or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://medvor.ru/uplcv?utm_term=artwork+approval+form+template PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/0fb5578c1b155dbd8d4bc8cc2d67d7d0/69246385840.pdfIn PDF document text
    • http://kaies.cn/upfiles/21060104485059848803nl6n.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/wuwaratisewoxakumopus.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/65c81d0765974def211927691d353f20/sakogixewunafawosojisugem.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-11/20210511065641734464.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ae45885b8b8---kevekofifosajitawexedogo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4a4b2bd9---61904629505.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/a48af0e35b8da6934c3e592ab8af578c/52729647005.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/d124bc4d5ba6bd00981c2be4f511f972/94916816210.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/62f88f3da8c7b38daebd3d14ea6e2c67/kugadibikibukusewi.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/51657306114.pdfIn PDF document text
    • https://giustofiori.it/file/22091161984.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/46593993796.pdfIn PDF document text
    • https://bataretak.com/img/files/file/wofededorolutij.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/872c0867d934209400ce48193278443e/nivelasafewamiwumanavew.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/67226981554.pdfIn PDF document text
    • https://actorconseil.com/files/file/17877046822.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA37 5072 bytes
SHA-256: 40f57dfe60bfdbcf1b956d3c69355538ac5c308a17efc707c1891c4c5fdd17a5
font_01_sfnt_off0000fb88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB88 10620 bytes
SHA-256: 656aa5750a75b6c4ac322e831b0b5f2696074132c54b04bf31bffc63c2f4e719