Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d52b7d38671d4c4…

MALICIOUS

PDF

120.0 KB Created: 2021-09-07 21:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1754b6914736366ef6c8d2b9dad33e1c SHA-1: 1639c4d5509c648cb0bf2fa8cdb3dd229a815614 SHA-256: 6d52b7d38671d4c4ab53ebf27be4a7d0d3b9decc2a9eae2214d4584903c343c8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting. This suggests the document is designed to lure users to malicious sites, potentially for SEO manipulation or to serve further malware. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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://cructi.ru/uplcv?utm_term=calend%C3%A1rio+juliano+2017+pdf PDF link annotation
    • http://appletechsolutions.com/userfiles/file/95034562174.pdfIn PDF document text
    • http://www.siposferenc.hu/html/vebazokafunojulafejab.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5t232m9ieqtljsdktl9fgnfj22/827995136.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/dc2c29eaa5188b18187ea91326f28fb2/61069658583.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/54815718235.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/qbktelq7ai2jneerqhjf9bhdie/95800995701.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160800a6fbdf71---27388141957.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/2913428572.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/wopevamobugunubi.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/xilegiribamapefekivoke.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/63454041083.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e7e935dde---44069515887.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fac8e41baa8---girividep.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c510b1281bb---7437376200.pdfIn PDF document text
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/mofudakulovugijuverozada.pdfIn PDF document text
    • http://hydrem.ru/images/file/nilizebijozijevuva.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/movipegilurin.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/22016b518e1bf34bc0712981784cee49/mumuletawuval.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/0c40a3222dc265b4cbc4494c324753d4/nefakojozax.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611343eee97ed---wiseridanobewedanani.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/a5da37fe1694c432878337c0ff72c846/tinigarigomorodomero.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/60188844599.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/76817962086.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab38a16f196---41813557054.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_off00016483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16483 11012 bytes
SHA-256: 7f38eb28f000dbdfaad66693125f04734faf8f7b71019aff9a9d4e9c4cc402a0
font_01_sfnt_off00017dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DCE 23112 bytes
SHA-256: 2c6e4d05f050e1d930e838488bada880431638683fa726f0e2039e0d26bd0c34
font_02_sfnt_off0001b87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B87F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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