Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e46be367348a97…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 18:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d8f2eaf14cbde3e223eb612633f4dd6 SHA-1: 3831536fbb5bb9e3785a0f3e105ea5041b99858f SHA-256: b2e46be367348a97c411d1e2186cabbb81eee2e7fcfa507bf51c89b34b427f3d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cjsc.se/ckfinder/userfiles/files/tabopotoz.pdf In PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/37169714746.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/85402633040.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/86285220362.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/xipadoweburetux.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/89694961115.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/b7q5v3uigvk46997j6jvt8hs0o/resar.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/bupabaridadigakupowetukad.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lidobupefufifum.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090113534973499.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fodinuve.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/26809532996.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/68815841793.pdfIn PDF document text
    • http://a-pluset.com/userfiles/46463046928.pdfIn PDF document text
    • https://investir-petroleo.pt/ckfinder/userfiles/files/fenudizageti.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/govanipubuligusilobewi.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec49e2896a---kigarepoboj.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/xaxodopurosid.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/rukobuwizap.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/15212749016.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d16ebde6---95054255909.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/73400439652.pdfIn PDF document text
    • https://people11people.com/uploads/File/vunusawufipelo.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/repezibeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hidden+alarm+androidPDF 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_off0000d943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD943 10136 bytes
SHA-256: 0a939bbf998e896c66424d45fe5c095a5eca6e797dbe7bca9cfa8611005d44f5
font_01_sfnt_off0000efb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CB 19432 bytes
SHA-256: 61e448994bd71d3b3c163e5760d4717b000e81d1ade10a7378a8d1d03172282a

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