Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d5f3929bc52784…

MALICIOUS

PDF

89.6 KB Created: 2021-07-15 12:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 466e753a4b78871b630255e57c7dd90e SHA-1: 1eddd5fe297bf530d722abe49c4a2d3bc02e15c1 SHA-256: c6d5f3929bc52784e4391af7b230e85afdbec502c78f4baadb30db0693704cc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to phishing sites or download further malware. The presence of multiple URLs hosted on compromised CMS upload directories suggests a tactic to disguise malicious links as legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://suma.ca/upload/editor/file/timetepojobalotoragoku.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3f6e28e0---75708545291.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/a1d2630c0955359b1432f2cf5ac483ba/10972328059.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4380ttb8vses4ni4hbmc4uam6u/wuwib.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/5049682761.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/46273476682.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f61d68659d---34262603279.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/25bad2c48a776459fe8b59e9ec0e425d/litazovunejezudobajeto.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/f94bef115cac7f4a54282e8ce1f7ca0e/fomuwojiragujiw.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/30825350360.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6cd40d43f8ad022822c45fef055b7fd6/2588369264.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/xegatezigo.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fdv1ua3vfhnhbk0eos8389j68e/28503472399.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/46983747966.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608675e61e957---90890849541.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/mamori.pdfIn PDF document text
    • http://jucal.es/images/file/63350377259.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/69093758970.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9c6751cbd9e6f9d6213e4cbcfabf91d0/54778482771.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/19355252692.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d233c7ae6bd---66342178278.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/22449106574.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/tglo75e95kljg98i69auqp5t5c/witedapurip.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/3149929120.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=chatterpix+for+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_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 10512 bytes
SHA-256: d2962e39dc4364d5263a69c86101c4bfdaa3dae7ee4af84db5560eb630564dc5
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F44 23204 bytes
SHA-256: 5666cd0ecd766f3f18b17838788adb719f5f56c77f1c4c710317e6a3bbf1f2ed

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