Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5c13c2875a7d426…

MALICIOUS

PDF

116.0 KB Created: 2021-07-29 20:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 59da79be4e090da0d14c63191701814c SHA-1: 5b89a00e9cbe11ba345cb04719372d35f46394be SHA-256: d5c13c2875a7d426f69572ea69d9f72ceea80dc4f3a314bc6cdecd1a74535bfa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple potentially compromised websites further supports a malicious intent, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/93226050923.pdf In PDF document text
    • https://ikima.fr/uploads/file/62454510324.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/vewemapo.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/d21f0457a67151bc71abaf7d76514745/tuguw.pdfIn PDF document text
    • http://fecoil.com/userfiles/file/16860284018.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/nolekinasurugewakad.pdfIn PDF document text
    • http://hhtaitung.com/CKEdit/upload/files/47856657443.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/278b28d6c78d6a36d98bbf237e0b9b48/89658912494.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/929a630059ab9d2328e13e1a51507d14/66978549780.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/81395410183.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/9e29571db89611d72fdba34aea92c3a4/30129553635.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078db0cbbf06---44640657771.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7aa58f89c---20231593741.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160df72c29851d---vavofufevula.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbe2911b74---23104148721.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/auflem6andp48e69dthrn3881j/xofekopoxixamupar.pdfIn PDF document text
    • https://airshow-bg.com/file/guwimefiwuwexalu.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/34518189274.pdfIn PDF document text
    • http://rauvuonsach.net/images/uploads/files/46211844931.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094b5352356b---43220060762.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/dabbd071028599062102527c433ca7d2/75669284840.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/wuvejinade.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/jofobuvitipixagu.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/lodeselimuwisubolebir.pdfIn PDF document text
    • http://lakes77.com/clients/47041/File/40349800012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=libro+de+cuentos+el+toro+fernandoPDF 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_off00015e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E47 19056 bytes
SHA-256: 1296ab5d43d5c72a1dd212073eca771db865546befe1411b304d67f22ba8c723
font_01_sfnt_off00018eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6C8 10664 bytes
SHA-256: 0001c3caaa5731b5eadf6f709a7b7ee6f1e8feb17bde8a4bef9834eace7e598e

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