Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca93dfa723bec2bb…

MALICIOUS

PDF

89.6 KB Created: 2021-07-19 14:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 87aceb6999897978a90986420e2ef745 SHA-1: 81c925dd3bcab78d5b7c6a17ad5854ada681eb0c SHA-256: ca93dfa723bec2bb1b6837f9f131214e21b07dd4965aa7c72aead051572aadc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://al-bandak.com/userfiles/file/xujetexitijezitadej.pdf In PDF document text
    • http://criollo-cocoa.com/userfiles/file/bonanafuvoxemele.pdfIn PDF document text
    • http://beautyyaurient.com/editor_upload/file/mazuwovawasupage.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/52941527067.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/b75f06d797f0f010998dff544ce82a85/zonazu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb7cae447---vidilubunozapad.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c9f1ab8ba---1837287396.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/1b537de72b0dd3ca939f8c7b81b4afd2/gureboman.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/l987a37vs4f8q9ed73p0ptpjfa/dosafaresexotavatenagaj.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/6dc0ccc14a7d81e051e5d9ab1c17a58c/2662649258.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/d3d5ff093cb9ba4c93761008b7375b4a/95236852619.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/4548326438.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/8sqijr93ktqlrgq17hj0sm0k28/67398751131.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210613_184229.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2q9hvdqbr0r92kvofst6g9ijp6/92755050350.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/95922045291.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfed23321f---57738663891.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/58104322421.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/55424779207.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210703022953_30479527.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0rmlv2phehp691fg7j4iend8l7/sixada.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b66863b20df---12709617635.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/p5nm46pbsniq9mdb29lo51v6a0/kunabuti.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9f94d68e0c2e7eda24ddfd08c13dd232/suxufatidapopegokumefizax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+fabric+of+human+bodyPDF 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_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10744 bytes
SHA-256: 281e02a9c89f80bd3081cb71fbd06818f2f38ecd72e4ce9d8547575c6f38a50b
font_01_sfnt_off000114ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D00 16964 bytes
SHA-256: cdd185b6913b8e629222b3285deb3d59e6a638d3fca9201f16cae7db4611a407