Malicious PDF — malware analysis report

Static analysis result for SHA-256 420439db33fb7adb…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 06:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: ec5b6af86ffd405e22370e1bd785b898 SHA-1: 4ea96a610e203a4248968cadaadd8e894d5b0010 SHA-256: 420439db33fb7adb1ab23c18aac7bfba02a3b910561d3c92220354dba9c15502
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The primary purpose appears to be directing users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://vrindaindia.com/php/joseph/uploads/file/84580735017.pdf In PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/gulos.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/86934865909.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094b91631b89---vekonasapilamolix.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/ce0e834ffb5e5a66b5101d0dbf07ca5d/33149025714.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/junepi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609da761380a8---97614685381.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/44536831545.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/zoxawusi.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/files/files/wumidixewajasojufapatu.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3b16d1b10---70723455116.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7bbe1d192---45865027151.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610fcb7b55ecd---77260627249.pdfIn PDF document text
    • https://rajatotogroup4.com/contents//files/55801232508.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/69254170538.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abc1b906a---61477249279.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/fefapisem.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/kariferelotogijiputojuruf.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/77098069740.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc07e9e76ae---gadabazesafavo.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/goruf.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gavifatutefijazupigegotuj.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/126de314969346992ecfa5afc1ef5b65/32951004826.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f94de6e7601---18298608734.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jual+innova+reborn+diesel+manualPDF 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_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16920 bytes
SHA-256: 3097489fdf2fc8cecb849428225f4fcfce58917a0c539c350cdd691962f3dd05
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 10608 bytes
SHA-256: 4b0e405bc7ad88a6aec26b8adf297ca4f6f52d1ae23825aa4dcfef9939748bf7