Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9c9e94c8d13fb6…

MALICIOUS

PDF

90.3 KB Created: 2021-06-27 01:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 830649f36ea76e1caaf261a7e5cd8ac7 SHA-1: 385953f2df79ca07c60e906481ac588b069bd9b2 SHA-256: 7f9c9e94c8d13fb6a699e6f91d91a51eb1969329db88ab39673f150b3cfa3069
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b482af8715edf10259415a36269b69b6/petavob.pdf In PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/oj3a5sfn30kehuju2o2njm9mmt/tetukuv.pdfIn PDF document text
    • http://xn--aknmedcal-wpbe.com/uploads/file/2467733919.pdfIn PDF document text
    • http://charivne.info/images/file/wasupizobapepizidejuda.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adfd930419e---losome.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d1886356af8e0900174e4a6fee6085c/desemoguz.pdfIn PDF document text
    • http://sdds.be/userfiles/file/36034756343.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd3703d306---10152350292.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/49421487998.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d56a7ca61f8---16326046846.pdfIn PDF document text
    • http://intergeored.com/upload/File/12436541929.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a9b026c93---3656077099.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808d2fc03fd---wagutotukilu.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/c9bcea674dea9212d974110aae7cb37a/25347244623.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/eq61cslrle4vq0kevuao9u3blj/52005682937.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a1860f80b19---23128286606.pdfIn PDF document text
    • http://buchtel1967.com/clients/26382/File/22184603249.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/gofumazitarezutatesuma.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b639dae09d4---39025267077.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b2a97f610ad081677572b940d2bb0482/11967814033.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e94952127---tetugifopalibaxes.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d2735df9---medugeridumikabulug.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/6b5300176db6f4438e9dc03d035d97bc/42424714385.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/73af8f71d28b953ef1245b2eeec813b0/51247213895.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f78ef491f1---jarifiwokuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=to+stand+up+someonePDF 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_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 16956 bytes
SHA-256: 5d5d732835b7cad25c5a58e63d8c6b684022b0d5c45aebe510b59e2155b5763e
font_01_sfnt_off00012c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7A 10376 bytes
SHA-256: ee7ba85f149ee062dd6fadf6592e80c49b1de376edcf0eb76ad889d7f15f7a0d
font_02_sfnt_off000143f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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