Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d4b6bb1ee6a880…

MALICIOUS

PDF

87.9 KB Created: 2021-09-06 12:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9a0c8007f531aaeb1e4391b7f1d6657c SHA-1: 539c1b5cf0c964dbad02e9b79ddcc9f4c998b1f8 SHA-256: 10d4b6bb1ee6a880224434a96488661d94c39cf6a69d3de3b53ace13c60009c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, as suggested by the link farm heuristics and the presence of numerous external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=water+pollution+information+in+marathi+language+pdf+free+download PDF link annotation
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/658e85d5151e2d1b6a01507c72201515/bexenuwapapowap.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/qvgc1rd1uho97f2a57hr5km0s9/kifaru.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/konak.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092323996788---nujejo.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3ca075ec5c11449aa97ccef1ffc3ae45/lezufokulogitekenewitov.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c882f89b0c8.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/68722827704.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/43430760785.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/53688436055.pdfIn PDF document text
    • https://aashianarealty.com/file/texumojoxedenemajo.pdfIn PDF document text
    • http://www.celso.org/download/xazifolufatatataguwaneta.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608512f2e0735---861975530.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/zivujokafodaboguxadis.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/jajisulizijeximof.pdfIn PDF document text
    • http://keitbg.com/images/files/4532785526.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/zifupitimajes.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b99431176a9---tomajajiju.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/7008550583.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103da9b6140f---91692259433.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/38b2d50372f9ce5b20d11d7a6dfee19a/34072851909.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c7e8de499---94310429296.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/38140874077.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/kokewupujiregoj.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/5575737397.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/91920745233.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc070e1fe5---32840068682.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/taxudijawaxuno.pdfIn PDF document text
    • https://medlineplus.gov/waterpollution.htmlIn 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_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A35 10956 bytes
SHA-256: 3af5b69c194224a83542a699f465a29e4e101ba9533f10efcf201b5e9da65329
font_02_sfnt_off0001232b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232B 17692 bytes
SHA-256: ce3b5b4b1532908d252625b09501a93a5e6825d3a564c7c25a5fbf6341b11642