Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd15b27580fbe648…

MALICIOUS

PDF

81.1 KB Created: 2021-09-14 02:26:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1dd0498a6c1a6258083d010426338c01 SHA-1: 45ba8a1e6e5122c839b983ba412f1b34852ffaa2 SHA-256: dd15b27580fbe648a5997845d6dc70804c766a3f746eab8f699cd3bac83dc896
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS uploads or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation by redirecting users to potentially harmful sites. The embedded JavaScript is a common method for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=competitor+seo+tracking PDF link annotation
    • http://ryukatsu.com/userData/board/file/2706470629.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/83478975478.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/80647885886.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/vasarivapuv.pdfIn PDF document text
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/23999986232.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eef64b8d7d---lovirakatam.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161385ccd442ff---vosasajumaponisik.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/xumagapunef.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/xezowuruvanuti.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/roduzigajutaz.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/zisitoni.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/15200290723.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/mesufafemolusetemixi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a229878e96---rifiguxoroxurizenejaga.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/22737261256.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/66335652625.pdfIn PDF document text
    • http://drivingschool-brno.eu/files/46493316834.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/sesefetesu.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/46997224324.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/93849200112.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/32247301269.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d27d51ffcb81baaffb771be15cf28e34/10072498471.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/jazuweroja.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/rililovawukoponisise.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_off0000da41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 10796 bytes
SHA-256: 8553ccfbb7357a1a08002c5915964e1850b3e0dd4a702628189442dd1edf10eb
font_01_sfnt_off0000f32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3F 17236 bytes
SHA-256: 993bb57bafc8ff96facb553ac48dff53656409a5a66cf977285e3e4853455393

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