Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f3db3e09be99c76…

MALICIOUS

PDF

73.9 KB Created: 2021-09-28 22:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bdf4bfd6ce463460c383b3bf33eb78d0 SHA-1: 034fcdd6cccd236a33cc405223e96d981e2f944e SHA-256: 5f3db3e09be99c764d9ef0513302840720c41c7edc408069fe5321b3bfe6a056
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan-like behavior. The document contains a link farm that points to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the nature of the heuristics strongly suggest a phishing or malware distribution attempt.

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://dogathermalhotel.com/resimler/files/16647052173.pdf In PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/28800995764.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/gopifavibabesuturusomofeb.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/SF2L9EctgK3z.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/21680666032.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210920_EFBED8081BF98A66.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/pojuvatekotesibebo.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/8648692320.pdfIn PDF document text
    • https://floresdeserrezuela.com/aym_image/files/metudimaxijokad.pdfIn PDF document text
    • http://tridiart.cl/ckfinder/userfiles/files/27087151582.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/sakaguta.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/h5301g70oa509gapppem5o2e71/bezoruvitozipefamizib.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/71616419289.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/30bab9dd165a31f96ace8c16f0522d8b/komezamuzanikisefaxativi.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/20302260692.pdfIn PDF document text
    • http://cmsrecuperocrediti.it/images/file/wuxofekewunenoditelavib.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/genuxinuzekepere.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/gosuri.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16135e127d9f44---6340891775.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210924211753.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/65526094979.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/19010792936.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/74107714125.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/faronizekiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+website+readerPDF 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_off0000b948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB948 18852 bytes
SHA-256: 38e9db92a549b13d4b454e67dce6a70be9f763a6024bdd9d2eeb028dab4f22f9
font_01_sfnt_off0000ea0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0B 10404 bytes
SHA-256: ae7cb63c4082ecf9772ef454e93c1e4e47ba443e57b36141c39e59cb59d9d8ab
font_02_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1