Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4816d343350cc1c…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 18:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: f6f335787ee4e8f10a5e16def3dca674 SHA-1: c8ee27a356780d2da697b2fe5b46affe76da66ae SHA-256: e4816d343350cc1ce9fd2f7e659a0f5c828dcfe465b6a4f55668cafb7575f3ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=effect+of+substituents+on+acidity+of+phenol+pdf PDF link annotation
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/a7e7a7c215ad7718bacfc9c8829fcf82/2421349126.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/64024992074.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b74567d7ba9---mawaxamulazisapo.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/jusivedosamurigewomazim.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/juxutafubibolimom.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/640dbc6b229ba9a7dbc638190643ee95/sadatixevizisalike.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202108040535351349.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf6ee7fe4---94941742442.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/kitonuxo.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/migifosujalamagogun.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/tesulawugovifakibuxudag.pdfIn PDF document text
    • http://chinazzjx.com/d/files/somadoxomurisigefe.pdfIn PDF document text
    • http://teplospectr.ru/images/files/zonerodatopogotaxujanila.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kotatefagopinudumevudofak.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2c4fc50dccf5f3ed756e1dc853d3e45a/68860837708.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/fuzabamidekugafuta.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a88a1ddb4c---22280665602.pdfIn PDF document text
    • http://sciattella.net/images/file/99838131030.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/589c884960c678a487e36368b06efeec/jisorebazos.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/6858ffb308c13b01cd8df5caf2eef880/33910527863.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202107/file/210724180110009157pet49ohmog55.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608899f0d5f95---94052140591.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767d41669db---38642704932.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b62eddcf---25904509072.pdfIn PDF document text
    • 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_off0000d0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D3 17556 bytes
SHA-256: dce70588926412ce0300b1936dd3cde4a59cb73001a2f70180a7aa3a6fb97cbc
font_01_sfnt_off0000fee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FB 10952 bytes
SHA-256: 872e63e9f3829b8a0654a706bf3930ec2af83b7fff927d765a7711641399dea6

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