Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98da343ae8e0e5a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 12:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 78e21ca88f5f608a6746f142332049e7 SHA-1: 1e7313599a2f4805708cf1382308dae03674eaa7 SHA-256: f98da343ae8e0e5a72f701cda1c52b9bce298b57107f3e9eac010549dd5f294f
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it's designed to redirect users to potentially malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM suggest a link farm strategy on compromised or disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=pdf+reader+carry+all+that+you+can+read PDF link annotation
    • http://4els.ru/uploads/images/files/vazamebojokotunegogaja.pdfIn PDF document text
    • http://qdjshg.com/files/file/83116343274.pdfIn PDF document text
    • http://cascad-trans.ru/files/fekege.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/suxipimugifovivatu.pdfIn PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/13838107196.pdfIn PDF document text
    • http://delve-cr.com/uploads/55813360330.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/81082520305.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/a3qtohekkorglg72e82pqthjc9/56433772273.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d563d7ad10bcb6b205dadaf8e7d0165b/19763149481.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/mifoj.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/37362178609.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/96630138062.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3fd303bb7---57113373800.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16136a439528c7---novikakuziveneduvoxe.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/17883198016.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/mizalu.pdfIn PDF document text
    • http://lucca.jpsoftware.sk/upload/files/xedojudadorawiniwovog.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/kulubeg.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/mebovexuwozuvamef.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/palonapivazarezu.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/6076210415.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/pazunudasojorupijananaxe.pdfIn PDF document text
    • https://t2sc.me/userfiles/dibisanabebuxufimir.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210918175042.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/13765968325.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/mopikotifagogexatu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c43ba3b54---nisejido.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_off0000d6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AD 16488 bytes
SHA-256: 789bfd6473ab95a66c3e25423e1aca6b74d7d6adc99c85c9097f1c0ae3bc3d52
font_01_sfnt_off000100e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F7 10528 bytes
SHA-256: 47b7d24982b40f83c62c3226bbbaaba5fed7b6245d13a7bd13b2cc04b668984b

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