Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04b5ca1eb63bdb3…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 22:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b841059e319f2973bf3888b869da4416 SHA-1: ff132cecd1dd45d6d296ae491d8154b5d9544689 SHA-256: a04b5ca1eb63bdb315390d7de163a17a4b910df04c760aba92601e7bcce39b6d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm points towards an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/68ab592751a960ee548e285c4eb564f8/26386292613.pdf In PDF document text
    • http://konberdbio.com/upload/files/64180731003.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zizamurob.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078332876af8---3541209954.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609bfb5b158f9---mijubuloda.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/95815178698.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1on168bq2cmea59og4rrqirco/85875577946.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/9d8e7be7d9a26ddf0f108e65138047da/63540973774.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/138929317be642c36a4e4e7577a8b9f8/48340848083.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735b8d7f72e---11949430374.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/38c8e77ab2cd3ab53122313c64e16d2e/94687070616.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d5ed1cef---pebitabejuwasolidoviminif.pdfIn PDF document text
    • http://songhakbbq.com/uploads/files/wixujod.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/t57116es7pecg8kce2d4m3i431/bofufopelewerogipetame.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/25255687883.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/surevi.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/9064034926.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf213b99a1---81333931243.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/71558766259.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/pawitigimukebi.pdfIn PDF document text
    • http://mousike.it/img_ins/files/35783697871.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609520addb49b---8128094552.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/datovevikelojoromonezeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=convert+pdf+sang+pptPDF 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_off0000d63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD63F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE51 18324 bytes
SHA-256: 3a7a5dd57d2b7095876d5a972552522a4eff403001b3cd8d15dec622534ab1e1
font_02_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 10632 bytes
SHA-256: bff426bf31ef05dfbb05de0606a7905b0cf52cd3dd538d8060fc8569d9fcfb41