Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9423dac99945209…

MALICIOUS

PDF

90.2 KB Created: 2021-08-31 20:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 778a3c0ac9bcf778af5c6e4112462eef SHA-1: f6b10ceed6980f75dd85ef3c0cbdb05108d5371c SHA-256: d9423dac999452097294e350b4c23919da1e71b51eb45e422c14664b64facb6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/274aaf03ce7300b0ca9dfa4c12342153/notetudeberasejisoxige.pdf In PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/13616470542a48445673d7ca5c39a2b3/dozor.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/1b84ba4fc1fa7adc7db526b32b899556/zexaf.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/8265520453.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/4447455759.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/97453340617.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/ximusijurek.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/mawenagelapiwavadeb.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/69895548560.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/85516914901.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/durotepodatetak.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160923fb3ebeb5---37332222236.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/47a2de2bf593e788de534194ec226058/lonowu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087da872095e---riminegenasimizanonene.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c52568e31d0---vifugatugajoniwureb.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ce7ab4e29f2a48a8aa7d3efd3987f6c1/xegolo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2426101fac---luverinuzutogevuxoronaxiv.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/20885494997.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/sofasevozonugasesadalifer.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/vifovefebevad.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/40437037485.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16128a1a71b735---xekobadazapazenoki.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/buxijidinujazizun.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/68312276400.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=intro+to+businessPDF 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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 18276 bytes
SHA-256: 01651e9c76909c0264cd66e49e94d144b932d50440db759954ab7a382a1d4266
font_01_sfnt_off00012b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B49 10084 bytes
SHA-256: 94c01f4eb8624bd1aa0169b85aa0efef3e61274f09775cbff18bb74e5afd6277
font_02_sfnt_off000141ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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