Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce51a49f0504d9b4…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 18:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d2e213354d32de4cc776bb50f68fd96b SHA-1: adc043a96261fe17df31277f4e2282530a1f5395 SHA-256: ce51a49f0504d9b4484f0c309f60c268eb588366892a9fd56f9199bd82d72c99
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS upload storage, suggesting it's designed to trick users into downloading a malicious payload. The presence of a visual download button further supports this phishing-like lure. ClamAV detection as Pdf.Phishing.Trojan confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=download+game+downhill+ppsspp+for+android PDF link annotation
    • http://nyitotthaz.hu/userfiles/files/gaxilozujofelanufezuwelor.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/xexizisupefu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/210a63f7609ebeabf07418a0c85aa9b0/86386588696.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/devugusubabo.pdfIn PDF document text
    • http://simonide.org/userfiles/file/21993993805.pdfIn PDF document text
    • http://checopharma.com/upload/files/84531647933.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/ac0c8a55c294143c55b8d7ccca80aa5f/5922747192.pdfIn PDF document text
    • https://andhimazhai.com/images/files/bebijonemagawalisuvi.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/pofidoxivuzonasagilamese.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/ripekajejefunaze.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/53330832452.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/jifolotogupime.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/juluronubi.pdfIn PDF document text
    • https://asiastudy.in/ckfinder/userfiles/files/47656208091.pdfIn PDF document text
    • http://telecycling.info/files/file/43164331821.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/85446369433.pdfIn PDF document text
    • http://spynet.gr/Administrator/uploads/userpics/OutPostImages/files/funomegesaz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad8fa08b6---74251573237.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/sifixupoxefivufijinex.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/rinoxidexoju.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/xanox.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/nabesigegopobidoruxodogis.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/73256157882.pdfIn PDF document text
    • http://strandedtattoo.info/file/17215159670.pdfIn PDF document text
    • 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_off0000dea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA0 10936 bytes
SHA-256: e162375ec74d99a9be1070c55b092887a495fca32b38de1992c389e275a822d1
font_01_sfnt_off0000f789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF789 18336 bytes
SHA-256: 5b98573c42a5aa588bd3a572a33a9c7ce2fe9cbd4d16b4176fe96f5e8c54c45f
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1