Malicious PDF — malware analysis report

Static analysis result for SHA-256 faead197ddcc6f99…

MALICIOUS

PDF

139.3 KB Created: 2021-06-25 13:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 3551b9ed4fbc1c1b810f916f2d9d61e6 SHA-1: ed373e21149f1de92b6c0df191024d52feb75c28 SHA-256: faead197ddcc6f9945ee8ebe9fe5944166aa3ef0f97af316035735cbab7cdc92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, a common tactic for distributing malware or conducting phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/164m5s1ql3bbd357hp436f3gvk/13209882534.pdf In PDF document text
    • http://bularz-auto.pl/images/userfiles/file/22745491899.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c6dd7031---72343358244.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/81575566395.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160983b8dbe73f---65956524354.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/b23b9ccadf8cc19fc009a5ad62130ad0/xomub.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/81805334124.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/90419289927.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080e9eeb835f---85919119043.pdfIn PDF document text
    • http://thedreaminitiative.org/Content/Admin/uploads/files/vejefu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160841b25ea89e---bedoze.pdfIn PDF document text
    • http://altinellerinsaat.net/UserFiles/file/xumegaxepaka.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/86598068947.pdfIn PDF document text
    • http://ha-sine.com/d/files/87991241968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=orthographic+projection+3dPDF 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_off0001bbcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BBCD 19196 bytes
SHA-256: d54a49cb8c6a130d9b36924cf9a38d0d55355cb5ebff8f00504418673649aa22
font_01_sfnt_off0001ef3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20752 10904 bytes
SHA-256: f9299b94ae104e8924cd22c34ae4aa92a6c6c876633018b641011809322c696e

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