Malicious PDF — malware analysis report

Static analysis result for SHA-256 379572644cf67dd9…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 23:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ae30e6b612bddb22f88550a8533866ce SHA-1: 5050bd617d7be303089076153d58fd85e615bc8a SHA-256: 379572644cf67dd9660f2fe92dac0788e89fc7f871f9983dff48a179778037bf
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, indicating a potential for malicious redirection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest that the document is part of a link farm designed to lure users to compromised or disposable hosting sites. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/784c35cf692cc400ab24158841c8b5c7/kubomuwutirukezebogigob.pdf In PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0133d7b88---dibamotusesivaret.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/fifixinurir.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/pjker92ctgfdd6gbe725k68nsu/rawazud.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8dce1c23e---64154114760.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/0e711ce0cad42e6447bdf7c5c0cf2b70/21329111626.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9e4dd135---26657238063.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/ucgjl10c6tjsn7ee57t9o3ba5g/78183720599.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe9735b6c4e---88101212042.pdfIn PDF document text
    • http://whatdwellswithin.com/file/59747064384.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1oqoqp2u6hk5eovqmk6571cfs2/21087634676.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021080111310848.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/juzozomenobunokoribagab.pdfIn PDF document text
    • https://gazelletr.com/userfiles/files/ranilazu.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/26591879328.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ca3b6de6---21770269366.pdfIn PDF document text
    • http://chenruichem.com/upload/files/74054268358.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/44021904557.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798cd76b8e7---gaxoluraleboguvamipitap.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/zapulorurita.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102b3e72fb68---zaxuxirisafimowuzogopig.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/su7hrh0tpo0o7u8e3o62dt635u/23524030645.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/269d668b50071b333c243899897a93f9/54847251228.pdfIn PDF document text
    • http://freeski.hu/freeski/file/82493868382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=medieval+philosophy+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_off0000c5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D8 18380 bytes
SHA-256: ff5cd579a7060588b19cc7e9f158ec25e5affce164a283ee72523f1872b8831f
font_01_sfnt_off0000f5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DE 10464 bytes
SHA-256: 6425b65bd0999b5c853b1a56e25c0d2b5774cebeba300e5ee65a93ae95b60fb8
font_02_sfnt_off00010dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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