Malicious PDF — malware analysis report

Static analysis result for SHA-256 947dc43dd6bd2034…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 16:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8c7acc60293219d1f6299561c2b69e07 SHA-1: fac2ffea17c96e97951d59cbab1cf90a6dbac56c SHA-256: 947dc43dd6bd203483c737ff7f31abbbdfeeee15ae970e9129d4a9b87b96011e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for malicious PDFs to execute code. It also features numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware.

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://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c0df13d3550e4563c2f9f6e2056b68db/jixiroduvegosexuzubapalus.pdf In PDF document text
    • http://sbs-group.co/userfiles/files/25545743924.pdfIn PDF document text
    • http://dzbnf.com/upload/file///jomasedowujujebalig.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/be2b401df007ef6476d491eb841abee2/jonejowugaguniwavobagijik.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/93493783209.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/82136104422.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/fuboke.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/058e7274d477643228877c72ef4efe01/vufor.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/7277136977.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/26913003792.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb8092e5a8---zufaz.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/10575951886.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/ladupovalutetikuxi.pdfIn PDF document text
    • http://kawoka.com/userfiles/file/govarowekazumoke.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/50735576665.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bec92fa8904---97470510146.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/95686815378.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/821efe1189a3ce0d77fee3ce9555e6cb/kufonibu.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/sowudofisejegi.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/41612055240.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/56214584413.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/42866511453.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/remowotiv.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd75e092af7---bozasabaniwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=inotropismo+negativo+pdfPDF 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_off0000c47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC93 10812 bytes
SHA-256: 8dd8f99242ad6a19c606c9d2002d70fadd2a2c3bef12e94ec073ab54f0f9bd71
font_02_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 17092 bytes
SHA-256: 3ccfd856af616fd57d62b753ea5fbddab5fc3e4d30ddefc180c58044033e2869