Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d41aeaf7e4a94d…

MALICIOUS

PDF

101.0 KB Created: 2021-07-18 13:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8cdc1855f3a86a8bbae7d9d37db0c1e0 SHA-1: 16aebde27bdae1d3c51200a06284bc9d73e9f77d SHA-256: f8d41aeaf7e4a94d62b09f7ca926a88cac42254b4dedb258fc10baeea5d9b48f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique used to distribute malware or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092167d8e5d3---25308264087.pdf In PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160879113ea7fd---69544922348.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/vivenalenediji.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36b2a6edf7---34629464058.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d18aee17a4a---buzolopefivikebutiduwiwiv.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078adfe5199c---98294098372.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab52324f993---52640861213.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098896bae245---11144147176.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8723ee97f8---80360831966.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/10679734942.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/gfvp8o1sa6uvdfb01i19c5jivl/65323673166.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/740d9d18d50025daa7a9bc6b52d772e3/29542273652.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/r8rk31sfrbgo3o5tpup4k5haqo/85534514487.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/3330279963.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/76694614844.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a790022c---vewugiwuvotutaj.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5628f2f7db---xasuru.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/92630325949.pdfIn PDF document text
    • http://devison-matras.com/upload/file/tubaviwozojuku.pdfIn PDF document text
    • http://scro.ru/pic/file/40064850106.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/26399155053.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/28170403906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=radiography+colleges+near+mePDF 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_off00012930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14142 17060 bytes
SHA-256: d8c92ccf2123b1646910548318c3ba9d52b3de8faad560d82632a42341e2b9a0
font_02_sfnt_off00016db2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DB2 11024 bytes
SHA-256: 6ef5d966b30d76cf1572e0625b7e856eba69ae01952a9abc87b0cbfcfdfb2941

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