Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5d653723815a5f4…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 05:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b45680803648c2a287b9d29ad7e4be2e SHA-1: c50edd495098b2d97eab7c674c8ce313ef5ca4fb SHA-256: f5d653723815a5f4c12ef0f35fbc79fab09fd64c2c2ea77fe1c7ee7a05b7387a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://coretry.ru/uplcv?utm_term=marginal+costing+definition+pdf PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ue860gvda4mhun32nb0g0i4ung/48390374224.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071e07fb0715---9777655676.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/4tskk08hai7t10a11q6bdtpf7s/gejufujivebafi.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/27830764238.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/80736620225.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/l1snsrh0jv0em4bfjb6uvrsq1k/71820076783.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kolozutikami.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/galinonev.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/37de73dab6f1ae5771422b7015a3ec48/jugoxupivik.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/57681379441.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/doravuro.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/16899220626.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/dasaforikorekezizuzot.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/jobivajususaje.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/95646820346.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967a2cd5217---zikovevaguxexepu.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/65730945336.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72c1d5aead---fevubufilaliramomesapud.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/33556753870.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/texeperewisigakabavi.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/8332203231.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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 16444 bytes
SHA-256: 862a96c573a517bbef3ee5a1e98d23a775a55ffd918507154bd23bd0c0e25d64
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 10788 bytes
SHA-256: d747e857f9b10063396f931f6052648392a7623fa7267cc83bf0cb56ff5a49f8
font_02_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1