Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb37b05906d321ae…

MALICIOUS

PDF

79.1 KB Created: 2021-06-26 12:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de2cf042e17e9ab11fea10d570efc58d SHA-1: 4352233e02e2c67c06af4d95bbca3137ce9a31ae SHA-256: fb37b05906d321ae894a576dec416ac1656ff576d64ea1e611162479df5c889a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, many of which point to compromised WordPress sites hosting further PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver further malicious content or phishing lures. The embedded JavaScript is likely responsible for initiating the download or redirection to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://hoangnhataudio.vn/media/files/4020464349.pdf In PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e3328a550---xuvepesor.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae65f1c2167---najifovadumatoxori.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/78805490473.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/10123522053.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ad7acbfaa---resuvawolox.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/xetex.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/42510162585.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc4d77238f---61894616679.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/dijemunokefutunakize.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847e33c6577---godusilakeled.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xofemakizil.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/13120642091.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/33159937699.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/46795703216.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609045cf8ffb4---kuboposubalexixibib.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/47788705217.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/mizonuledugoxiridewegeden.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe9eef196d---17162304353.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/masogodetobamuwuloradid.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609054b3137c1---30473856725.pdfIn PDF document text
    • http://attlas.center/userfiles/file/27245022749.pdfIn PDF document text
    • https://chung-pei.com/userfiles/file/wejaxuline.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/gigup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=boss+therm+br1+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95D 1676 bytes
SHA-256: 6247598c4edb7cf8862d8f012be1dbd1c6f3e64f6b5dae793dc70e2d340405f0
font_01_sfnt_off0000d14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14F 10628 bytes
SHA-256: f9cd50d05d72892b539c3fcd0a3203e115a27e6b2e125fecf7c1eb73ed414469
font_02_sfnt_off0000e98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 16652 bytes
SHA-256: 6d62f62d188f6621319fa777fb3a8d63b108f89e764be9e73e7ced1fb9db1a90

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