Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc95efb24bbb8c5a…

MALICIOUS

PDF

73.6 KB Created: 2021-09-06 07:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eafa32590999c40db89a38bd0783c59f SHA-1: c2df0c67f1a2778ca949702544f5b02e8b3de030 SHA-256: cc95efb24bbb8c5aed9dbf10c02d8b063da0f914810df6256092db6deea4a688
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute further malicious content or manipulate search engine results. No scripts were extracted, but the presence of numerous external links indicates a redirection-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://kuni.ro/app/webroot/files/userfiles/files/gadotumazaxadov.pdf In PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/r8c8bpapr43n9sa56urfu1h5l5/17516266480.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7fb6a8d6---noxizuwilu.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7139a720---81679763099.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/34364180829.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/17650422514.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/a5hiaikpdcnnbpm2hf632pd8c3/gifosedunon.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/12052384521.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/82791574580.pdfIn PDF document text
    • http://bvmnotarissen.nl/app/webroot/files/ckeditor_files/files/6021477290.pdfIn PDF document text
    • http://caramelitos.sk/files/komasurusojaruragoximemo.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46dea8d4bb---faxipomofukamisamusatut.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608283f827cae---38193498769.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab33e9328d9---pibopabujupufawivexizuwo.pdfIn PDF document text
    • http://intertribo.sk/files/64349738543.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160920e4321d48---63597756881.pdfIn PDF document text
    • https://maturana.cl/upload/file/25969826976.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608521b4a9b4e---wupama.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/kixugefemonovolarem.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/7608de1110beeb3b7b9d8d2fe53af81d/mixuxajixozizam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=translating+algebraic+expressions+worksheets+with+answers+pdfPDF 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_off0000bb0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0B 11284 bytes
SHA-256: 6ba7132b6ae23d4c5b92fbd1df3b1c1b8e59d4860ca9fc7b2422424a739e65a8
font_01_sfnt_off0000d527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 16744 bytes
SHA-256: 4628f05b6c61d7e262f0f07dafa255e9e639388bf9807a285735e3ef3bcaa383

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