Malicious PDF — malware analysis report

Static analysis result for SHA-256 e52585e08fe40887…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 02:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f28af67b5144f8d1a9c2bf689a45b39a SHA-1: 197f4d40cf016c18cc07b6462c313e8c206ab140 SHA-256: e52585e08fe4088716fd3dd61ca064a444f91de1b1814f4c898a8764af55b40c
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript and a high ML classifier score further support its malicious nature. ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://drafthe.ru/uplcv?utm_term=best+survival+games+on+play+store PDF link annotation
    • http://driver-jazda.pl/upload/file/relilesale.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/75072659416.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/77440324201.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/68803643914.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///kemupekatizeminob.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/90488600948.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/jetifodulu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1612f792e1811f---xuwupem.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/xukamareku.pdfIn PDF document text
    • http://mlight.cz/archiv/file/bizufapurejekas.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbbb885a22---nerubi.pdfIn PDF document text
    • https://777mto.org/contents/files/76409162517.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/togidexeverigom.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/bikoxabofovivika.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/bozaxuwozimetasi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db681930a---juxat.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/51591140726.pdfIn PDF document text
    • http://newo.ru/files/files/zavoxovexovoselifejote.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/41803104774.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/70565312263.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/miwafaxo.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/91176063890.pdfIn PDF document text
    • http://chayka-svg.ru/files/rijepewa.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/xegumobibogevufefijagisi.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_off0000b007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB007 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC819 16892 bytes
SHA-256: 1ed9e3c4b94d65f7bde0cc8bc149e2d42484f555ec6f691f47058706d3969d98
font_02_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 10928 bytes
SHA-256: e4c80d654bf9c390776a770d446315a3df5a19d1ac5253b440ca9381e8177953

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