Malicious PDF — malware analysis report

Static analysis result for SHA-256 c34de2cc852cd746…

MALICIOUS

PDF

75.5 KB Created: 2021-09-04 16:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4e08bd6639f15dac59ece6f83498edf8 SHA-1: 09232d523349254b0799452a28a79b481f2c2c2a SHA-256: c34de2cc852cd746c27636d61b7ddd542cffe05dce6a3660a4e0a6760fe2398f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple compromised WordPress sites suggests an attempt to distribute further malware or conduct phishing. The URLs found are hosted on compromised WordPress sites, likely serving as a distribution point for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d00d11d12b4---743981990.pdf In PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608032be28418---42311109115.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc94aa035a---viluxelipin.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8e3a2c7f8c852c394ad5270a07c58bbb/janunuzakatuwaso.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/454434f2300c6ccc878ebced85d55f58/wonojerizog.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160838a0aef251---mesoligigijimu.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/28999366544.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bb451eac5a8---71866209938.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f5a48d9aa6fd839fab5cf5b23de1c989/45340576153.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f806e50eb3b---korenojonuxapivonepu.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098298592116---28752758070.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/sikikemawezesatu.pdfIn PDF document text
    • http://envigest.cz/upload/file/88933841454.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/77643789251.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/38827719928.pdfIn PDF document text
    • http://okwecare.com/usr/userfiles/files/30294001195.pdfIn PDF document text
    • https://smithsgame.com/calisma2/files/uploads/58564376133.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/jogopasuzijivif.pdfIn PDF document text
    • http://proxima-design.cz/files/file/46680162316.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/59702001544.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/49456371897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=m%C3%A9thode+analytique+d%C3%A9finition+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_off0000c227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC227 17644 bytes
SHA-256: abcaca6d93604ec5412e2d5d9f875a27072093a75b8c3e8bb944847f18fc08c4
font_01_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10836 bytes
SHA-256: 32d06a967f4964dfdcd327cefbba3e07afb1b6eeb66e5cb59d158e91089b0525

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