Malicious PDF — malware analysis report

Static analysis result for SHA-256 9268c36b1cdb20da…

MALICIOUS

PDF

75.0 KB Created: 2021-09-12 22:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 501a09ec5d0eb1b40f78f778d9849e7c SHA-1: 9da826ccd903da78351cf01f805e6a607ba5fd57 SHA-256: 9268c36b1cdb20da62a5ef74d3e87b356908ca154cd222cbc9ccfba94b0a60e2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest a link farm designed to redirect users to malicious sites or download further payloads. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=bible+dictionary+download+pdf PDF link annotation
    • http://bong-dem-long.org/upload/editor/files/83895775348.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/ribagerujazuwefiwelisurab.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/55349979132.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/kusesipadidexusuzotal.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/57828646269.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sf5ubj59j9noaos2jtv36kke80/70865328933.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/67618695490.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/70535781396.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/bivad.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/dufomoja.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f87957c02c---70608784506.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/25610241558.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210911190419.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/resafubamavalenelikawuru.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/47ebd57fc283a2a9b81856dab848d8ff/nudojomozogelo.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/mupekonogupej.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/vibibinopituwilak.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/28747324047.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/ridupasotimuwugafidisadi.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/pamavuzadukonimikikiz.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/10442642070.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161359a2b50461---73566437730.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/ribaratenot.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/zotigawetegawiwavetowek.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_off0000c135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC135 10840 bytes
SHA-256: 51010b6fea12b1f9d8a20f63b31d70dd7f49c69dd9c3afb425ec22ecbe3e860a
font_01_sfnt_off0000da31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 16932 bytes
SHA-256: 057db96cc606cf8eff8a8313711efc6da7201d78267188df638fee9fd76ad334

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