Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa682db0ac790cfd…

MALICIOUS

PDF

88.6 KB Created: 2021-07-14 07:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ead7e79adfd611cc0e13174f18c876d3 SHA-1: 596afece8cc6594ccad402ba48bbb64faf65d6f7 SHA-256: fa682db0ac790cfd02e6458a7ed6e0c3c4ce2fcc921815e3e57de0800d3816f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a deliberate effort to create a network of links pointing to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=the+care+and+keeping+of+you+2+pdf PDF link annotation
    • http://aelma.com/sites/default/userfiles/file/17344824392.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4tfcd4ckjcscggn3boplhuieo9/sixepukifapalopubuki.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/4b0571edf78e5b00fbb03d630be73b6b/76657639070.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f8ae7aa2a9da3786b47abc9e3ad27fc5/gexetunadufivagegozejabem.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079d3bdba466---95917113601.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/386v1s4npctmvkrh6581t41qm6/79299813749.pdfIn PDF document text
    • http://lucann.com/Upload/file/zakowidubixilenimixenefa.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96febec3d---88209129618.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/13200302987.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160841d87b0e44---86696110364.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf2aa201b0---19937060429.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90d9cc835---topujagidipagarijegimisij.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/tivoripolaj.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/letapopulelovirejuz.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e9f650231f0fbc091d5897bed831abc6/xekegu.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/d9a45d403fd9660dd6fe6f775a842011/15992996543.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/nawoxiligoxevofibuzifamuk.pdfIn PDF document text
    • https://sbsoftware.ro/admin/userfiles/file/tunutes.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96c0f4a00e5e1422e0e9d44ef3cc6c50/ferurejadumotedusov.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/nodemipudevode.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/vuxapu.pdfIn PDF document text
    • https://werbemittelag.chupload/file/20819982382.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4da85b4e---73402898634.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607415febb953---6406702149.pdfIn PDF document text
    • 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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 17088 bytes
SHA-256: 85dbb18eca087b2fbaecdf4d0a9faffee7a71d555ad87fd12264cedc2c479c09
font_01_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 10976 bytes
SHA-256: 07a77a3e9fc51ca4ca925d8c216813c36a3d7cc10651f5459c1c6fe71b0113c1

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