Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc46343bd45b91af…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 21:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0c6b37f5b82195e3fb242786362121e SHA-1: f0f474870a21525e8da595a6ab64451463b96248 SHA-256: bc46343bd45b91af613e458af59ef516ac5a374e7f329a57c847b56f425aabd9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised or disposable domains. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging strongly suggests malicious intent, likely to lure users to malicious sites for phishing or malware downloads. The document body is heavily obfuscated and appears to be metadata from the wkhtmltopdf tool, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=sita+warrior+of+mithila+read+online+free PDF link annotation
    • http://nusratali.com/userfiles/files/73622010530.pdfIn PDF document text
    • https://gornjastubica.hr/files/2873538212.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109121846446182.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/sirab.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/51732773657.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/kujavipituderupar.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/11628035816147d5a4d8267.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/58712477964.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/maponi.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/vowezud.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/65152874720.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/11523636747.pdfIn PDF document text
    • https://activepymes.com/pub/file/nowiboxexofenozenasoge.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/buralorivixudovowidure.pdfIn PDF document text
    • http://ufcnagykanizsa.hu/userfiles/file/daxida.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/tiwukoxezaxetelemamafela.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161435a2330699---genipokakegatugarizekuve.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb345504f5---rojenufopemivavobupegeni.pdfIn PDF document text
    • https://limsurdua.com/contents/files/38811201871.pdfIn PDF document text
    • https://www.studiorosaliabusco.it/ckfinder/userfiles/files/63708271936.pdfIn PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/2126002898.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/028b670bc0cdede6e8a4f10ad14f4456/27093706780.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161463852aedc4---38667862567.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_off0000de9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9D 10612 bytes
SHA-256: a308ee3a0b01c64d5bed897a3813d80fac535507d9fc8656199f2113180d4947
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECD 17856 bytes
SHA-256: 9a4330590b28cca633f4fe3caf38bc3880c89556477163d439a6c08f97ac429f

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