Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b4ab6f676c3079…

MALICIOUS

PDF

106.2 KB Created: 2021-09-02 19:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81b3d046ff92d30ea6f96f053cafa956 SHA-1: c18d9e9550d43d6eff5effc162e1d1d999bb6462 SHA-256: c0b4ab6f676c3079e625aa0371b5b494eff288cd52d7520458986f903de2b47b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites and disposable domains, indicating an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://nuuts.mn/uploads/assets/26693150034.pdf In PDF document text
    • http://iwishop.hu/file/bakaz.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/41d7de3c258389394441eb9e5542bb47/24216218840.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/tisomelidufijozima.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2fc5c3c5e---87798505798.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16099f151a1d3e---davabanis.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5af587dddf---14380743338.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/gdufh54kmrjdrg2fpi91gf6tpq/mapam.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/vimozafabanelojofubezefor.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b7a70df950---83308891526.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607729b546b80---45729806358.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4ae199305---pewoxetebotopejilewedadu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/aa4de991cdeb944d32fb7069e78e575c/gubiwavuzebibemulufar.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202108151555511531.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/texegavozigefomakun.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d32261f8c---xoberibamebuwanusuxubine.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/dozubet.pdfIn PDF document text
    • http://secretinvitation.net/images/files/sopalogubisobimazitadu.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/migagax.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/lifuvibaxaguxizamev.pdfIn PDF document text
    • http://premium-h.info/files/files/78362167054.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/nusofoboduxunovekakinivot.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/jokedagofepus.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/84227331479.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38dc330d7---16395294017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=ramleela+natak+pdf+downloadPDF 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_off00013817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13817 19804 bytes
SHA-256: a32cf571d6524dcf3a5c5c328aa89157087432cb43f12abdbb1814f130c4fc48
font_01_sfnt_off00016b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18397 10520 bytes
SHA-256: 40233106d4316d4d93120eced484499cb70a5e1013c91b9a0f1b8b1f922f921e