Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6b46a8400f2fde…

MALICIOUS

PDF

87.2 KB Created: 2021-09-05 20:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: beb9dea2375e3da527d576993f62d133 SHA-1: edeb8b455f3b090fd92bda5a23f0fbdd0696e45e SHA-256: fb6b46a8400f2fdee07ca202b0bfe5a8321870703a9d831821aeaf1f08f5663f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous URLs pointing to compromised CMS uploads and potentially malicious content. The document body is heavily obfuscated, preventing a clear understanding of its direct intent, but the overall structure and URL analysis suggest it is designed to redirect users to malicious sites.

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 https://nomylo.ru/uplcv?utm_term=excel+terminology+worksheet PDF link annotation
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/9643527218.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/merogonixaxokojawolaperad.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/39030658923.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/13a487d9f09b99098933d3e08699ef20/57223965382.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/85390943253.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/posegejosesaxuxujojudofi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s4udt12pdsvtm84jtorcsck0f1/busopilegoxelos.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7b31c7f81---75914025798.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4017609991---midulusemorukidarav.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/86991308560.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/65163220322.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/kevutifaminon.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/8vguioonbdlb5k7rpur7ti4l04/49793882410.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082272cd8fc4---xenetowebijifidifu.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/zekewawopalavoxaxasujapa.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/75524653679.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a014c69f825---pigakivopiviburowad.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/78072888623.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c422b922169---72223018874.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/06/03/50190460993.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/5373823865.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/kukebezoxegugomo.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/xetajamixalasafuruxokif.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a5312d1dc---tunesasosefelofija.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_off0000ef4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10765 10892 bytes
SHA-256: 0e8f4c004573aad3e89a31d01560958d2ae247e3617255ebfae9b42ccb56bf17
font_02_sfnt_off00012074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12074 17864 bytes
SHA-256: a0a256d44caf1f3b90ad75d0fc92a28538e19acde7c385f6c483575dffebbced

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