Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdda6c0fef9aefdc…

MALICIOUS

PDF

69.9 KB Created: 2021-07-20 02:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0aca1a246ffa5d47272c5dd6869881b9 SHA-1: 33e977812a83aef06fe3a933d525b63ba3f06049 SHA-256: cdda6c0fef9aefdc1e937661736a1c1480da58326677258a079164fb9c08a2e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm designed to direct users to various websites, many of which are hosted on compromised CMS platforms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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.
  • 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://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/luci34mtlq9e98roblhe99l5gv/nagumidajotiwetaxege.pdf In PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9d3026220---33340691752.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/ae87ce85994f34d60517161dff7fb8fc/gaxasobomelivudasotet.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/romuxupatigukesixaxavob.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/56036594855.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/govisowivefonafa.pdfIn PDF document text
    • https://vientangluc.com/upload/files/86415970498.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/97073817359.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/roveroxef.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/ligebigojizejufigaxu.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/55567682869.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/9608777046.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/guvutunerofenulomiboli.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc410bb8c2---65223111603.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/woxotaxev.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/a130fff79c77e919e0bfa8dcae05a0f0/87074681186.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d831254d6a869b5320ba768edc539695/11945086525.pdfIn PDF document text
    • http://fitviewer.biz/files/file/75279298635.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b6b8413c4d89b87c7765146972fdc08f/55610828860.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/kitemakaje.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/1575260211.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/8959900bc56c79d8efc8a41af07e7254/24149212292.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e65e68441ad9bba82d6baa491898f094/jipopanatipidowelagoxedi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bc7b16c1d---xomixinefoxitikezokenima.pdfIn PDF document text
    • https://apizf.org/public/file/dafebaroba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=dog+aggressive+after+neuteringPDF 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_off0000b64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 14280 bytes
SHA-256: 8c11cfbf9a5c1695747b2551d93412115a2c54b17308b579dbe3421c30936c92
font_01_sfnt_off0000da0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0E 10508 bytes
SHA-256: 438e3e815dc20eae844324a1d5383a98eed952a8dea21fe8cd5bca1bb79c5eed
font_02_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1