Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f3421449ebbda6…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 02:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 27be465901b314e1afff45bb15396aad SHA-1: 2ab33bd430f1dd1933498080854e9da4fc5e9a12 SHA-256: 03f3421449ebbda67fab57861d3214e9b7951d904572dac1fa155f5c98950aca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable or compromised hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of embedded JavaScript indicates an intent to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=convertir+acsm+pdf PDF link annotation
    • http://phunggia.biz/userfiles/file/46664287554.pdfIn PDF document text
    • http://farashimirooz.com/files/wevobasokerew.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a0f38743c---81096851272.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/seguwarafamoba.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/65750421665.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135621b3fc27---33703771637.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/11786554719.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/tanelavojolawewezagaj.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/vakilil.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/fibivukopoxerero.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/74442440138.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/99678933920.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/52204587390.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/gisosuzikemotari.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/javawo.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/nugeze.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lumijupalamewa.pdfIn PDF document text
    • http://metabolit.ru/files/file/javokemowarulizi.pdfIn PDF document text
    • http://land89.com/ckupload/files/98186121754.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d997c509bc---didaletojufe.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210907140323.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e92924f87cf52f881d54ed84f900c9d9/lenumed.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/71357791471.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/wadoruwimekajuvagax.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/xopezolosireboso.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_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 19508 bytes
SHA-256: 0338453f7e7bcf1d5fbca7c28be1c71587af07197849ba64d82fe2074b3bf694
font_01_sfnt_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 10832 bytes
SHA-256: 60d91929b4b0d545dd653f8a008190677081a2474d3bd6f0600ef4b2e5135647
font_02_sfnt_off000124aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1