Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dd27487dee63471…

MALICIOUS

PDF

82.1 KB Created: 2021-08-07 16:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b62fba7ec203a97b35b715529fdd0a49 SHA-1: c3bfbee910b8379b4570e8e1dcbd4affd485439d SHA-256: 8dd27487dee634711c1641e6a5cf9505c92e668eebca4ffe0281f5f823814d63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. While no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious intent to redirect users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075e79807222---wekopuxabufejobixa.pdf In PDF document text
    • https://binarbaid.com/public_html/userfiles/file/zefonopokezodib.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0127f6dcf09831b2093090f728ce81d3/37330173717.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/1623817135.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/o4meqi2ler8bimsihsad8pubnr/sajadoroke.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d017d3f23bc16a8f16b2b7be440ef1b7/luxuroniwowebemak.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b235df266f3---wupasakuwuvowudajefoxu.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4f185d09a---21174968540.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3319379c8a0709aba9f03b654539b984/57100766047.pdfIn PDF document text
    • http://doyen.cc/images/upload/File/90208493796.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/gezid.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/108766119c00456746e6b271005402d4/95538640629.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/09u9cotnmontr36qrhtbj7q1d2/30968054885.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/61129074855.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/e2ktn6bg9ca8j718uvv179i46a/nuguw.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/lugilalavupabodelo.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/11802306792.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b92018e42---segeji.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2bc6b439b4d78befd1c18520361b706/zinelatokunolilax.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/zizamerade.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f13c748ebb---mafokiwibede.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1627885531.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/16c6ab2fb9c88d6095744606cb6df2f3/xowogefugomajatu.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/22372452374.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qmhbrbdrsptje22pbpp29b9epg/46144058102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+play+roblox+on+chrome+browserPDF 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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 16624 bytes
SHA-256: 23b8c906b76545fb23a5ecba017f57938a2f0dd41440c70e5aa3086cec18336c
font_01_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E9 10980 bytes
SHA-256: caab046cf9ae27867f797091a1a678f4ddb56b6e2b0b49e0a436485faac394e8