Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4b63ea175c3812…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 13:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 66bf19959f56d8e73c1ca424e1f84a46 SHA-1: eecd634fab34035a0ec9bbae61af82685fd094e0 SHA-256: ca4b63ea175c38129f1386edc492e83e1d866294b78d095e70e86ac1fb9f44f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of a link farm and the overall detection indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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 http://rayanchem.com/d/files/52219951466.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fa9b7499df58db974ad53d63f5b5012c/1115075749.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/wusubirosomagibowewose.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137058aac99f---88495718040.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7176ec8c---sapazebabotamofumosak.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/tebufolupisarofoxapudapo.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4e0794bcc---78791548231.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e7260dcc3---48022702685.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/zafovepoz.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/4978688517.pdfIn PDF document text
    • https://sandp-engineering.com/ckfinder/userfiles/files/29514599554.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/wurexulafanuwipol.pdfIn PDF document text
    • http://stisk.com/file/55660496015.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210906042148.pdfIn PDF document text
    • http://net-work.cz/data/file/lijaxejofi.pdfIn PDF document text
    • http://ridendo.cz/files/file/palogel.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/tabeporuluvepuwazude.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/viveluvefa.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210908_095543.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/musurolefawozixod.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1e5b8eb5e---sopufuxen.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/83ed319bdf6cd550eba8055cd8344838/bebubekadivewuge.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/50841190319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=jurassic+park+putlockersPDF 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_off0000aee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE5 15420 bytes
SHA-256: 440351b3269ef4a2960cc7e81ac77c1dee11fb65d2a774b1bfe576501e1ac8d5
font_01_sfnt_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10444 bytes
SHA-256: 4b461d9eada1d4d5ca3c9e484b7db8c962eec80714f6be2d502c2ecbb3c94a8b

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