Malicious PDF — malware analysis report

Static analysis result for SHA-256 fefd3fdefbc3bbc2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-05 09:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d873e82b3cd93f86a564c4bf9d1a32f SHA-1: a9b8925562616985f302a8e90966f656b271a7da SHA-256: fefd3fdefbc3bbc24e9f98277e12ada8e0311c187a8d7128b57af2e2cd2237c7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDF documents from web pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://shih-tzu.ro/files/file/zajederowidetotebefif.pdf In PDF document text
    • http://unsersohn.com/images/file/97302821154.pdfIn PDF document text
    • http://fermobkorea.com/userfiles/file/20210903191636.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/76972483824.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/45750715510.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/59882358684.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/pemitupumuw.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/2b49gsabc50uctfbn8ja18njo5/jinizisoxane.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/2524781022.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021541722527534.pdfIn PDF document text
    • https://aedwea.com/upload/foto/12665626282.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/tabonudobesokavofinoz.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/bepudakana.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/volewubowe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16079462f66642---fobubalekurolaf.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/feluxisonolapasavefizu.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/163675506701620575349.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b131f2daeb9---43894350095.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/v9q55kp2g90prldolf8f0vkcm5/39945414309.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e8337ed02e7---72493141687.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/xofasepuxewofe.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/watadamolubaf.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/ximipuwosojujivepafaja.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/wirefopugaluxofimug.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/tususakuwuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=republica+mexicana+mapa+pdfPDF 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_off0000cd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD57 19328 bytes
SHA-256: 185003e98ae80d0102b1ed37de620fd964deac2b489f49d6e93b19436f8559ba
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 10684 bytes
SHA-256: 878d0bb57b0cfaf32ef14e033bc2c44e57765e5e6103e745c4cabef733ab5b91
font_02_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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