Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ec8836f34c8a9d…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 23:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f86b02351e6097cb9a61ad4acf39dae4 SHA-1: 711cfabbfd7f1b114c24b0d3ff3b14048b2006a3 SHA-256: 36ec8836f34c8a9d319712fdac8ad7e2f74a20c4de90d7c43534e3aebb244bbe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://crysiq.ru/uplcv?utm_term=watch+real+time+with+bill+maher+full+episodes+online+free PDF link annotation
    • http://donghotam.com/luutru/files/rijutowemi.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/66023056961.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/ravidutivud.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/53294155964.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/64931613445.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/34352013114.pdfIn PDF document text
    • https://vientangluc.com/upload/files/6070659289.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/xomajorizefejitu.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6172455665.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/bevezibabapowa.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/folefa.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/38cf26476d938081cadb65980a80ec71/14960317650.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109140452187057.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/69629275933.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/nixedajamoritemew.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/fibijanavoverusarume.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138dc7d944f1---ruwesiwejojebiribit.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309113a08c2---46704806005.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/vejuwisaluvojugugi.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/77951044506.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f9a23204a---vukadekimujukukapik.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16137631575c76---kofabebalitapudufiruvopi.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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 11204 bytes
SHA-256: 60522ede78d174a06f5f9c2962ed8bf6b57b28c54ac76bac12e8366c67a804cb
font_01_sfnt_off0000f81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81B 17068 bytes
SHA-256: 464548672ee38abb5355bc2cff290adc663a96fed36b80eef2f87f0f94cbd1d4
font_02_sfnt_off0001241c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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