Malicious PDF — malware analysis report

Static analysis result for SHA-256 63631d3cda34efb3…

MALICIOUS

PDF

72.5 KB Created: 2021-09-12 05:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 557a8ab705f307e0b6304694424eb1a2 SHA-1: 4b47a59efa6dfd1d10dcf3bd8f93beb4de7a9086 SHA-256: 63631d3cda34efb327bc9841e90f6846132e418a28270ca7d80d4d8e9fa75c9f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://laborke.ru/uplcv?utm_term=hack+pubg+lite+pc PDF link annotation
    • http://bulk-supplies.com/userfiles/file/tatujexegekatavutokop.pdfIn PDF document text
    • https://highrise.pl/file/8130899526.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/88212927675.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cd088a3a5c47effaabf88dd27235e8a0/bekadepamugugijotileto.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/16402640226.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/jopekidukizavizot.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/fdfa3f8f90d0534874c0c46b44e81ef4/tamukuxidadinefivakar.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fabagorozezixisibovez.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/mukomir.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132297933b77---61362507644.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/10745418548.pdfIn PDF document text
    • http://pk.mo/userfiles/file/vuseda.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/7267926206.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/69800936891.pdfIn PDF document text
    • https://medius.sk/userfiles/file/vusoxesagaroruvodomegex.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/mezegemagutifibekazap.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/87378068984.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d0aabb89---kajosoletogarenazinus.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/pesulakadutupinodugi.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210909_4A54B6DB0A44E4EA.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/kesaguralosadigesoratinu.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotozasaxibifimupegof.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/xapulefakerivix.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/vetoboga.pdfIn 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://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_off0000bd1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD1B 10380 bytes
SHA-256: 45f4e3ac2d2e5608a8d775f8260464e7110a5ad384c48917980d6bdb4ce89a3f
font_01_sfnt_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 15844 bytes
SHA-256: c23bf6ed374f72975e2da615aab39a180a3810c3b59037e2944e31b02d2e8c37
font_02_sfnt_off0000fcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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