Malicious PDF — malware analysis report

Static analysis result for SHA-256 a525a9ca8fca8482…

MALICIOUS

PDF

96.5 KB Created: 2021-06-26 15:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d4e692a8f06f59efd0e6fa1e7b42d1e8 SHA-1: 9e938442869421f5ff68b01e8d66d55e5dfdc7b0 SHA-256: a525a9ca8fca8482968c1dd81697e850c0a94cb804b26fcefb75e9ac8bd7bb6a
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, including WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a 'download button' heuristic suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://garglob.ru/uplcv?utm_term=collaboration+ppt+template PDF link annotation
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ldepn504ju4mk1pakt5nrs2qmb/84694275484.pdfIn PDF document text
    • http://imi.vc/upload/files/702382735.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/a387a2d52b7deccf47eec5d24e5a2041/94643693916.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160941024ce9ac---68506992024.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/3006d50f1958bbd049d82c5347f64837/japinaloboj.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/64178985161.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809c2b2a881---48728336693.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/1945bb888f90cd1778425ffe8493ad19/56191833029.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a73f361eab2---kizalafemuwiparokum.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/buq47qhn1v0o0c7vch3lvmqer2/10682985782.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/bv714gp43kdnjk076u0kaotr5m/zajajugabiweke.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/c65e737eeb5a87f461cd1b9bfa3a60a3/77599481657.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/98671786465.pdfIn PDF document text
    • http://springbook.no/files/8323457993.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7545c1b09202669ceb538617808da94a/19995752771.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/40847702080.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0ba0bffd---gefub.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082c39cbf71b---81356041426.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e28cd2efd5---68940596108.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/f759fdf8828e41c88ec57680f369fd0e/pojopem.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/95163901190.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16070d9cb702b1---16323645766.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/l9npf38ihs5lpkjss5fl346r8k/lenividozeb.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/dukokofefisevisadi.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_off000114d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D9 18292 bytes
SHA-256: cd3f544cff0d76809a19bfb7eec04041c3d2cb300594e033eab935edcc212942
font_01_sfnt_off00014582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D99 10416 bytes
SHA-256: 08924769a38e09d824a31e823abfaa489d4dbd10977a193e55a5e67790df9250

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