Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36192d8669addba…

MALICIOUS

PDF

79.2 KB Created: 2021-09-19 11:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 221a9e05153d7a4081640c8d196e6f8c SHA-1: 26a4c57830983261f3e4d58bab88a0c6c521fd7a SHA-256: c36192d8669addba6a4ef184586a00238b94ec9a84dc652319886c0b05fb6f83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=the+road+jack+london+pdf PDF link annotation
    • http://annuaire-regional.com/ckfinder/userfiles/files/51176565457.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/xozijirumikebawofebap.pdfIn PDF document text
    • http://jljemc.com/upload/files/571138706.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614653ee1dc3d---lurejegesofokibibesazo.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/42090472016.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/padixujeretinirireso.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/97362351564.pdfIn PDF document text
    • http://slovoveri.org/userfiles/47146521751.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/gabimive.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/41530718590.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dfacafa2f---zuvuxagowilinagofixefiw.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/vebegufa.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/72329472729.pdfIn PDF document text
    • http://cabini.it/userfiles/files/vaxemowowilavoxed.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36399911155.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161373e9d4e82a---33673121727.pdfIn PDF document text
    • https://betsin.org/userfiles/files/60757610948.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc335cc14e---kuxoge.pdfIn PDF document text
    • https://hse.tw/upload/file/xagat.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/tagezinowidetaxafilapiwud.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/47105056713.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/lovutujirulasaz.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/lizuxuragusegowugolimi.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/50542967959.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/gazubopexudetesadomidola.pdfIn PDF document text
    • http://www.erealitysolutions.com/tennisontario/assets/appsadmin/js/ckfinder/userfiles/files/bugubodabogazabebinavod.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_off0000d248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD248 17460 bytes
SHA-256: e718b110d44f12d55eca8178eaff7719217b13acb35d0d44dd8aa682d5ae1d74
font_01_sfnt_off0000ff53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001176a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176A 10544 bytes
SHA-256: 3746ea3b052e2a9b2aacad2b1eac5c476c2dbf1406cb9dc4a7cabc3c387461c1

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