Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9b9c0cf1c5358b…

MALICIOUS

PDF

86.8 KB Created: 2021-09-18 03:16:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbd567ce8df8dea093c3674e2e42610f SHA-1: e27855a690f68bc0aac46e56ae73316729d3f4c6 SHA-256: ee9b9c0cf1c5358be3afb0ff38a429f5bdb71b904d600531315a74f27dee338c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://tagsu.com/attachments/fckattachments/file/94024514984.pdf In PDF document text
    • https://tlproduct.com/userfiles/file/79095500530.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613a905fec028---87638095659.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zupebikoselegapidor.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/wedaxawojizatenaxupofem.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/8486194118.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/kunala.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/316ddb1fc2a891db3d8f1128d2579e5e/bilexuretusibereko.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/60779478788.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/36797614028.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144c289244fb---80638437520.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/nizuris.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/jufuxu.pdfIn PDF document text
    • http://sakesushilakehavasu.com/uploads/files/22649882563.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/texibejorarowasapepajo.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/27922751502.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/vabirofexawarej.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/gumufedewobi.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/76891132676.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109170155171779.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/67374085816.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/11593557749.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/92162350753.pdfIn PDF document text
    • https://www.edm-medical.net/ckfinder/userfiles/files/rimaduxixobuno.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/dibukudesepilaruwod.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/38636403802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=highschool+of+the+dead+manga+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_off0000e56a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56A 20736 bytes
SHA-256: e9653608430eae55c45b99903dfab7f966e5a35572e312ca8d9f2c6423b401ea
font_01_sfnt_off00011c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13441 10960 bytes
SHA-256: 777e8b8136f27541e60c439d3a701484bdcc6986745c84837709a7b08020495c

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