Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c7a982fff7785a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-07 10:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bd092a7e335995a130d7bff46333d594 SHA-1: 0482fae3e074a196142cced6fcad900ec16fcae3 SHA-256: 49c7a982fff7785a5cfd25ceee1f2bf3827c2f3970ba6aafe6e5ab1dc1f57587
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 ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a phishing or malware distribution campaign.

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 http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e89cfd1583---66929275886.pdf In PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f510tv1fgbah5s97t23eikuf73/gevazunebosexukuvanozi.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161126d4baa66b---52056501604.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e0adc22e2f81c7a36737273d47d8af3d/vomapaxeki.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1456f6ea7c---97876890927.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jipimazepepe.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/59768948895.pdfIn PDF document text
    • http://commsoft.nu/demo/ktb/wsmbilder/files/91930968959.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/44240225827.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/82664946200.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/jupugonifu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7ee358c2---96079222123.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/96311869354.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079c3eeeb6c7---40027810684.pdfIn PDF document text
    • http://hrudolf.com/userfiles/lusili.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/51029113836.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/vajolalubavijupen.pdfIn PDF document text
    • http://toonesk.com/upload/zukiguvezopuziniwizovuko.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/voloxigubajagulafusaxemu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160809f43ed8d0---midipodi.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/zakafipax.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109011223367231.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa9c5251d1---judawuwudidabafenewuk.pdfIn PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/julibina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=lavignac+1a+pdf+freePDF 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_off0000bb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB7A 10436 bytes
SHA-256: f3626e26a404da3a4744683afa335f644219567aee071f516fdae01b6ea2a09b
font_01_sfnt_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 15668 bytes
SHA-256: 3788c6db5d81834a5a6a421fb720e7f2b2f32323be3232ac79dbd2329d87b176

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