Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5e169cd9c3fcb8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 17:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6d41d2afc881554ac509581772d541cd SHA-1: 24a91b0f874df4ca143d0a3c90cb36b1ee917bbb SHA-256: 8c5e169cd9c3fcb848e76ee725e3cab1b89973c99a14892b50da46f0c80c9bcc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lyonsinn.com/nbloom/fckuploads/file/76779081628.pdf In PDF document text
    • https://sarvodayasamaj.uk/upload/files/bavasumomowutoriku.pdfIn PDF document text
    • https://rajakedua.com/contents/files/saforexudibetopipigawu.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/55811858692.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/73482285626.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/45787368424.pdfIn PDF document text
    • https://laser123.com/geektic/files/5893196243.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/63630818575.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613edf402510a---25024884895.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/pogureboburos.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd35d9baab---55372900500.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb55a319ba---82531035756.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/kivuketulaj.pdfIn PDF document text
    • http://patroha.hu/file/46675283133.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/67609829930.pdfIn PDF document text
    • https://makenie.com/upload/files/zowirulezukowefulewerufal.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e31587708b---71499218451.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/sk6sktnbln18m5snrqj94vqlq4/68238363517.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/38451602598.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/43914406939.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109131158307375.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/83804666545.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c44a107c3276347fdfd8915231d54a00/82824291796.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=download+fifty+shades+songsPDF link annotation
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/5409825590.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_off0000c2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CF 17240 bytes
SHA-256: fc035092e42109278f60750b36158a26bd93ed727a93ff0e6af031e35a9b635e
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AE 10732 bytes
SHA-256: bcbb377a26d7c9b4b0da340c409e4bb0a93aeb46bd7684f460651dfe78671abe

Open this report in the interactive analyzer, or submit your own file for analysis.