Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcae5bc8a85cf9b2…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 16:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8ef434fd6dec42ab3fd34465f7a492f4 SHA-1: 9df43325f853f098647342b5859064e9d9b421eb SHA-256: fcae5bc8a85cf9b24fd61676c86d40bd7e42fc3fe57e51dc2e39acebcca4a8e9
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains or compromised WordPress sites, indicative of a link farm designed to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF_URI heuristics and the ML_NYX_PDF_MALICIOUS firing support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://arvikabc.com/images/uploadedimages/file/takunuti.pdf In PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nutukolizabamen.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/rereka.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/13654141771.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/vapufetaweliwila.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/63252984380.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/misunifuritovu.pdfIn PDF document text
    • http://allineers.netlovestories.com/upload/files/pajupiwepaj.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/46719615868.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/pexano.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/gikomol.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613677910157d---19280249187.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/48420458362.pdfPDF link annotation
    • http://fitviewer.biz/files/file/doxijeloxegigega.pdfIn PDF document text
    • http://lasermedia.cn/userfiles/file/vuwefolixemewubes.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/69656703135.pdfIn PDF document text
    • http://sergeybazarov.ru/file/xifapote.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/2483356116.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/wanajupimerovibifaxa.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/tunivudir.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffe18986f---tojafovamugujowipaxuba.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139431909de2---72680351345.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/jiwusov.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/90946699694.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/zebami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=roblox+blox+fruits+codesPDF 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_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 10592 bytes
SHA-256: 939f1026d92ae596811f207c52cc683c5e9cea3f61ba337bc745d60b426ec238
font_01_sfnt_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A17 18156 bytes
SHA-256: 2fd502092562ce55d9849de74d9b4b99b17c3bc7dad25100142ab76ab12cafed