Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e4d29e797e8d78…

MALICIOUS

PDF

84.5 KB Created: 2021-07-09 09:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4c0c5c00fb85b0bb04455fef474cd6b SHA-1: cfebfed6e462461ccec2ab549cc35ae84e4ec222 SHA-256: e8e4d29e797e8d78528ee20c70dbbeb547d883f356acffbf34523b5a9e8ccccd
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. The ML classifier also assigned a high probability of maliciousness. The primary attack pattern involves directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=colors+that+go+with+bronze PDF link annotation
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ee792d13530ece409554687fdabf3dba/82682462213.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/66947214206.pdfIn PDF document text
    • http://canadanur.com/resimler/files/webafakegixabazuposo.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/ximaxuzunujejixenuruv.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c86e97a832---tezewefizekozemiwidi.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/32278512184.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/figegapixusivizoxe.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/9eeac82a42e4d1a5414bfab535023cae/mebotagezidugefugi.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/1997808913.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0cd13bd785150133d3476abd2b7afd36/vejik.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/99121595038.pdfIn PDF document text
    • http://whitepurdeespires.com/clients/b/ba/ba703c466af5784ee38134b9d09df413/File/fexakitibutabovobarepu.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/32014818672.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/dd54f7acfddcc491e6ed990088ba596f/38959055163.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/20716783179.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ec6e341---wuwabatukij.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc735e77f---nitubatavexekuxub.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d4b29e6664f6345ed268c54a4bdbe79/21087215260.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/32005746774.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607544a34723d---jukasojiga.pdfIn PDF document text
    • http://flomojapan.com/upload/files/titat.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c1f8092aa950ddd68c5f05fe5311f3a9/1675575269.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_off0000e868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 10704 bytes
SHA-256: da77f56359f65486d7e415c78ccde9254652ac2cfb3a0c3af0c00747782c8bd1
font_01_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 17016 bytes
SHA-256: fdf0d4df58c757949447833f35e831393148ec9bd4c444991e31d4868d553452
font_02_sfnt_off00012cfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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