Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bec04d5f8b092d…

MALICIOUS

PDF

74.3 KB Created: 2021-09-06 21:19:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f1fdc046663583dfd40d5d717de30dd SHA-1: 38a7f291902be65c30b78c441c4801153c973d2c SHA-256: d4bec04d5f8b092d10004460baedaed984169ca62b6556280676e59b4c67aded
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The file also contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a second-stage payload or lead the user to a phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1611aec0f0e1e1---zelabobogav.pdf In PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/guzidamizuwo.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/vikebikigunu.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/mujesamojuzoruzimen.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/u8ni764a3li1gpnd5tpgesca9t/kikelurejakupokemuf.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/mobevatudikakabufe.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48474791d---14278828672.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/61772705039.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c97d4d63030---3063765638.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/dekulokizowufutazowo.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/83357044406.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/pogejefikawuga.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/kvg5k2hpq20ulev27ovtc9kn5m/kosuw.pdfIn PDF document text
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/wawilajumaz.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d81a4ee2a---94496662351.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/tiketubobitegeke.pdfIn PDF document text
    • https://crc.creativechange.net/ckfinder/userfiles/files/jefobamutipuzipoxi.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/10785644667.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/vvb3q813n9lhpt6kbd5ef9kj5g/dipariroxibomu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079e0dedb514---19720058106.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086808f76089---5627197471.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/banijirekedaruz.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/2afalbfvkdsvtg0827u4gr8260/48691014608.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/vhrqfq1o276bi58ip6hls7deeu/91379175746.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/76670350361.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a60feb56ff3---soliwekabegibugekuro.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/585d1c08a819f2194b51ebd6d676acda/99738858070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=sql+queries+practice+book+pdfPDF 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_off0000c0dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0DD 11060 bytes
SHA-256: b0c5a7bbcc90a06f80dba525048284a80b188ebd7a50439a8f942f216bb5f851
font_01_sfnt_off0000da4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4C 15892 bytes
SHA-256: b0aad3b65ecfdae8a0c4e2ae38beae8753d8d043aac4355578d3f36935f479e6
font_02_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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