Malicious PDF — malware analysis report

Static analysis result for SHA-256 369f52b54138cb1f…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 23:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c3b1a15fad0e3fff4412ef8fe582180 SHA-1: e71c5e702b37ccfb5983dee5ffe5f57914672eda SHA-256: 369f52b54138cb1f17f5e0c8234cb05f230581071b801c7761bb15f16816207d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm pointing to compromised WordPress upload storage and disposable hosting. This suggests an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://centronegozi.com/public/92485102021.pdf In PDF document text
    • http://smcertificationservices.com/userfiles/files/61915027012.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/rijamadikatikivilim.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/13926578755.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9446c5d9e---gurowukiv.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/17771692525.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbc8cd18a---78512957250.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/85068977500.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/kefumalu.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropalaboralbarata.com/userfiles/file/4871354548.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/91541662815.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/fakolofizibatopove.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/59323043064.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/7392981618.pdfIn PDF document text
    • http://erdbau-rauch.at/tumigare.pdfIn PDF document text
    • https://maggievanostrand.com/uploads/media/file/21328810426.pdfIn PDF document text
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/88306868796.pdfIn PDF document text
    • https://ayurmitra.com/files/file/59543824726.pdfIn PDF document text
    • https://biocoils.com/img/file/80782881228.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/13/file/55956625929.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/mbjsk8f32ii4cif1ng0hei6rg4/vofam.pdfIn PDF document text
    • http://chithanhplastics.com/uploads/userfiles/file/37555956177.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/36149599835.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464fc96588b---wotenadoxefomejebuwila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=english+to+mandarinPDF 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_off0000d783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD783 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9A 10544 bytes
SHA-256: 686562a5291b09b28225553c2663d9a14ff5352d9b5fcf43780e166eb84f5fe0
font_02_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 18092 bytes
SHA-256: f0c83473e00de617e7959e757f4367ee422a58fc63d70f550baae210f95263e1

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