Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb6a8f383ceb974…

MALICIOUS

PDF

87.5 KB Created: 2021-07-17 03:04:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9541e173ded2d0023b8b05f828b89e23 SHA-1: 923a0a7e1a97ad630e3b37894d525d933c647cf7 SHA-256: 5fb6a8f383ceb974331f00bf06e87d4cae8843ed5a4b69d048632b843c0699fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other domains, likely intended to redirect users to phishing pages or download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607241f8a30af---zarusugapuzibo.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/9d75b99fa7b6e91abd77990932696722/memagesumuzazez.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609111a3e5721---28614459274.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/bofozumowiwuduletibegafix.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3e620ef3f---93888986205.pdfIn PDF document text
    • http://zatacorp.com/upload/files/87863034860.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/vomef.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a415576e8e1---31425471513.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c1305a4297b---xitawapevisumeledug.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ebf65945---gowipegev.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/54746605070.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/27950126074.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/sotilafafagi.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/18363372725.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/raselusunefoker.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725e3b048b7---27773028561.pdfIn PDF document text
    • https://mimpidia.com/contents//files/81465079395.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/52417738913.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/locnkrj5t9tkc98m9atkvlknq1/41560453091.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/df5930c11454b1f34856fab9ecf15b67/25477879302.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/51357570406.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c13f845f2dc---wusoz.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3c2876eb4f34cf6db08c0e95d3cfb796/9261099151.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/xizurevab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=epcot+center+ticketsPDF 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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 10232 bytes
SHA-256: f1fd06a04402f8987926bcfc9b12ca61498f798e2133b2bae5abceee3570b69b
font_01_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 18436 bytes
SHA-256: ea50739b1ce96486beb4384bd9d493c586f41095a8d3f658dc74ebb7c614a488

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