Malicious PDF — malware analysis report

Static analysis result for SHA-256 46403678f7b094f2…

MALICIOUS

PDF

93.1 KB Created: 2021-07-26 00:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 79bf04620c9632d5da5ca0ec752ccce0 SHA-1: 37f3392e2647815f71782c6fbf8da2b0f99beeec SHA-256: 46403678f7b094f243e20e2314da339acc6e50b27fd66f65d0b7e95ed7d870e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are part of a link farm designed to direct users to external content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://aslplastic.com/ckfinder/userfiles/files/romabita.pdf In PDF document text
    • http://smartvoicecom.com/userfiles/mipamikaf.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c634512d19---97054023836.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/eabaac37d88a032b827996a2663f253d/76514608020.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/99339499266.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da1f33af6---2179433176.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/xanozejowelekareki.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/85201360732.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a7c7beb29---kixopilujijivaxipiguzuva.pdfIn PDF document text
    • http://resheto.ru/users_images//fck/file/50906008723.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1e2234a47---sigaluz.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/dunetuninit.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f10644ca07ac4a9680630ecbaa8f13e6/90360542474.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/36b2c9f517fae99e3ffa655321eb4087/3605942348.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160712a575512e---75419994156.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/papimiluki.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021060915481616.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16096df8fb975d---6592346538.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f44682c413---53418453292.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/wewavipiduxuxuzoxixux.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/72bbec818852f9dfca0e21fcc7126c31/pomaresezudepiwixidob.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083f10bea8ba---rejemowopipexuxukopa.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/tvt6gll6k5rn2gohv0kqg2n381/rojozemisufuvefaregotoxa.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6fb0844a6---73942664827.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/98592925500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=do+you+need+physical+therapy+after+broken+wristPDF 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_off00010625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10625 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 17152 bytes
SHA-256: 192d8a0cf432cce7cbd01099007cc3885d8a203877c16736ae2ba43a9cd01d63
font_02_sfnt_off00014b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B08 11252 bytes
SHA-256: a5468ed6a5d402df37125eac6714a62a0a94a5ad2139f03ffaa12bed93a424dd