Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18d5ccd50449803…

MALICIOUS

PDF

73.9 KB Created: 2021-09-04 18:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7260d428fbaf507a18449b0b958d65bb SHA-1: 06d4b5ac458258a7388205401fb0bf4c32d25b10 SHA-256: e18d5ccd5044980372727aa5906935c5e53f045856844907bdcc0576b9b2de94
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. Multiple heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8652eee1---jufur.pdf In PDF document text
    • https://mamotato.ro/userfiles/file/pukesub.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/tnnr35c5jh75hvb71mjg3n7s3s/99043872038.pdfIn PDF document text
    • https://flyags.com/editorResources/file///71302247877.pdfIn PDF document text
    • https://activepymes.com/pub/file/tekomodifiz.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160adac41c9ba1---zijarebuvez.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/xibukaza.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd87d398d---fabovivikitumobi.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/b2daslq5k8nd91rtiims4jf124/lovalapunuxowileniliritu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751ab26ae1e---kazoxiv.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/jitemudafitelopinef.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92e0f066edc020a1ab35855e14e18ee9/zusazibikabume.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5d6ba9de---80965545087.pdfIn PDF document text
    • http://maydangson.com/vietkiendo/upload/file/46191169690.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/54140890709.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcf2b208a0---33196166471.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f42df9db8223b0f40d477f32c7ecefef/lufok.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/sekefebaf.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/90a677b03fdf61b51a1dca0b3db38e07/sevabasugorodad.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095954d30a70---78153600385.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/9018650757.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/notiwapinesax.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af78f078c42---kujotu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610ec4017a866---fexumuvejorinezuwefam.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732f4fd3a8f---jimukutipapojuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=out+of+school+youth+research+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_off0000bd31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD31 10760 bytes
SHA-256: f0ff5b3965a69eb2d43b4a15a1417b80625c60e351aa6d78b49c74608c72e197
font_01_sfnt_off0000d636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 16792 bytes
SHA-256: c3c52f7999b822dfa3dde9853fc63742c35f53fa47f6652dcca61bc25909ad8d