Malicious PDF — malware analysis report

Static analysis result for SHA-256 89835da95f1ec554…

MALICIOUS

PDF

77.1 KB Created: 2021-09-15 18:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e145f1bf2b3ad3f640b81558c9924091 SHA-1: 3efabd8c2ed16c6ea51d45f1de905d3112bb8378 SHA-256: 89835da95f1ec554fb05d596c87858a584c6a2357bbf8d2733240bd7fa409a04
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/dekexefene.pdf In PDF document text
    • https://satesayap.com/contents/files/repemukokazixetuvit.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/51006143173.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/94350701071.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/bowigidovupu.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/93781936319.pdfIn PDF document text
    • https://bongkartuantakur.com/contents/files/roxuregadamepejovobipax.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/lujagil.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/ferimatibupexo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ume2dfbiv0d74t3fbp1uo2tdf4/pajisofekemibamefavukem.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/76903737960.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613f76f385b77.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tibitiketi.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/2831772130.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/weruzorafumed.pdfIn PDF document text
    • https://petribax.com/userfiles/file/sazewonufazisosedutitolu.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/sixuzerowiragijubefiramab.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/7341980045.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613196290dc04---63763683890.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/2bjp6gc603b70qjabn095b3bh8/gemazifoliwenosusiz.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/15288956049.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/xizikupisulagut.pdfIn PDF document text
    • http://borneneskontor-landsforening.dk/userfiles/file/33228338788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+save+encrypted+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_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 16392 bytes
SHA-256: 016b3601a5aa0c4fdedcb51704a6b5fd5f46f7f913e05d313de8a0e2d5d99de0
font_01_sfnt_off0000f5f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F6 10732 bytes
SHA-256: 3284cefdf00bc0a2010605f483b77467af455ea681d84bd6520cce6e6596e6a8
font_02_sfnt_off00010ece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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