Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cedaf09b9e9fa07…

MALICIOUS

PDF

88.3 KB Created: 2021-09-06 14:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e71d0e195b885f5c66ee0f744c10c80f SHA-1: 1eefb0dc7cb983e9727a788aba13d9f880b4a7da SHA-256: 2cedaf09b9e9fa07afc6aea1915a9628108aab306db71a86539a22a9ae577287
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=sonnet+william+shakespeare+pdf PDF link annotation
    • https://1877painters.com/FCKeditor/file/3238940796.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/latodedolu.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/pb3e2ngktpd0nc8na8o58j942p/87710535660.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e2f9a837bd710c93cb531e58f9534b8/napunetizifavor.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/35036700594.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/zavezixirexozisexemar.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/fixozuvojupigumesuni.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/fusolalujelujufibub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d39525e6b6---49389779068.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/14706451842.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb98846148---wugodikomegusevopo.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/94766891066.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160f58891d6365---lidutuko.pdfIn PDF document text
    • http://zzweien.com/d/files/xagirenota.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/lobiwegotidobonivosarigub.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/e6vlibptg72k9eflghhetfh6cb/suwejesuzasufawujuxinan.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/543ccc24bc71fca7d4c7c052431c2893/99511542109.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/losaje.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c30788bc80e---58598894649.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/gjla57fkaui79oib8t4ucg23vn/32756124928.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e51ad4dcd47---69369903823.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/gonumulajenilulogivuj.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/gadeveziribeforu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/98614265938.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_off0000f153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF153 11016 bytes
SHA-256: 7c107eaaf3b49f30b624f1160f32e2051ac63d7a7af90776d9af266a375c6250
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 19204 bytes
SHA-256: 9965438bd7ed93ee02ac3cc9f631febfe3940b311fdfa1e6c6271d7b064af4cc
font_02_sfnt_off00013b97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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