Malicious PDF — malware analysis report

Static analysis result for SHA-256 1642a1d7f0f302ba…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 13:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 76aeec2b7bb87e5862cc9bb6c0622c7a SHA-1: 2042e50421366d7e81b19de782cece50a3c20e79 SHA-256: 1642a1d7f0f302baad6c1f48d07da3293c19a43543614594559ca5ff544dedc8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • 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://execdentalclinic.com/uploads/ckfinder/userfiles/files/90344050580.pdf In PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6b8e462c7---95917652669.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sl7kpnu9mc37tm1iku036pmd30/97484658247.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d3c9b3b18399238cb3163381d366fb15/75475149735.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d29a5c785c---73567462061.pdfIn PDF document text
    • http://namlongprojects.com/images/uploads/files/besigopixefenunef.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/kadarukixodufitexufarirel.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/64247959081.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/k6pcbrqh7oqi5dlvt379s4ap5u/kexesuzerobe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeab77e2b3---lanedodazatosusawelovube.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44a122265---biwupeba.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9ed85e43b---61431831353.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/89663443109.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8n9b7av8g0b4mtpf2nqpl3oa92/judonep.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/jpcva25thssrp6e1fe9neaqc88/mogotexopewaxiwil.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/64042626875.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/66529431615.pdfIn PDF document text
    • https://kham.vn/userfiles/file/rixozelujej.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/82871871541.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210830104552-1874157224.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/kekuniterotumewawanuzik.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/6974890823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=coloring+addition+worksheet+kindergartenPDF 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_off0000b776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB776 15056 bytes
SHA-256: 5f5f346e4e46fb9e0be3eb0729462030fcc22b1541e748d15d44205031d556ec
font_01_sfnt_off0000dd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10736 bytes
SHA-256: 875b7898f94e6968fc1d96c64ba453e1014792ce6b62dccd14e752412f27c400

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