Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a2ae8111be8947…

MALICIOUS

PDF

139.3 KB Created: 2021-07-15 11:08:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a6660636a5380205ae8260c57c3953ea SHA-1: d3a7b0130ac0ea18edf0b69c6529dbd4e0a51315 SHA-256: e8a2ae8111be8947564c935dd5e34c8ce71aca80d5da12d37ef42f97fff149f7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather to host numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/e9ffa4d6e2df4216cc8cb178479f2b36/69882146217.pdf In PDF document text
    • https://confetti-seasons.ru/upload/files/xogexaravejuxewemuliwinog.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160774b8a695cb---naxikinavaj.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/82140263f2ae8b5a9efac425fb10ff60/bepanebobak.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b11cee209---xarugonamejezikimina.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/38067550997.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/fugiwij.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160efd65fb820c---xotulutijeg.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad07ad6f2d0---85444635372.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f160a41bd---62414238622.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/e22dc479d98486946b6beb350aeae7d1/993471348.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/gosemejamodonogetupewejum.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a490212393---vupulomebotofon.pdfIn PDF document text
    • http://bigpictureresources.com/userfilesbigpicture/file/luvojejeketu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/wuxabeguvorugofi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608722ce6a031---romuxelarulusoseviji.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/63834315556.pdfIn PDF document text
    • https://curvy.tw/upload/files/50565798255.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c90065ee816---81584727854.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609653b38feee---40803634139.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2205d2390ad52ec9e1a491c3e3efac84/zoratowin.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/61078162191.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/ffa1e21f21d31cfe765e66755966d6e7/xabakeniwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=civilization+in+tagalogPDF 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_off0001bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFC1 10040 bytes
SHA-256: a85ffe639c6a7b48123fe2c717ba9c4bce3a37fbd239b0d380e63d2402cf45ff
font_01_sfnt_off0001d647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D647 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ee59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE59 20140 bytes
SHA-256: fe94357a793b5fdfef421224427dd059f6ddf9a4a3fde37784d692bb523b05f8

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