Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa880572b1e44402…

MALICIOUS

PDF

62.7 KB Created: 2021-05-28 15:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8aeeec596f036860681c8cf3047f937 SHA-1: 2547852af6d81d97c0160a3e751b7aa25cb11a43 SHA-256: fa880572b1e44402946f4268d02518432ce726de9e56449ffa5ba248004841a2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure, likely attempting to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8593

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=free+hbo+go+account+generator
    • https://alkalacarservice.com/public_html/userfiles/file/sixolanogog.pdf
    • http://agiusfuneraldirectors.com/files/file/lakajizepesu.pdf
    • http://jtour.vn/userfiles/file/22693122040.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/13bd22c901452c90a2df04406aa84d9f/wavizopus.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/9cfd149f5d5802198b17acdacf3b091b/11875342905.pdf
    • http://qytbearing.com/upfile/file/velimibumukunosawunemuw.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082997631b92---jexug.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079ef3e32836---dibinawimasaju.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/cb0721744aeb5c233a30b3a65eb3cce3/92731407773.pdf
    • https://aartipalette.com/userfiles/file/kosojomewodofol.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/tevukgqglk39bn2ievqojtir6q/luxanuwazolatiz.pdf
    • http://artecgroupservices.com/imagenes/file/zuwediwazenetopez.pdf
    • https://myphi.biz/nbloom/fckuploads/file/10728021509.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/18eaacee3f6b950866c1dc18f015353a/47994476036.pdf
    • https://sunarchegypt.com/userfiles/file/vunufasaliva.pdf
    • https://bititechnika.com/uploads/file/kovabajelitejojuditesodi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd45.bin
a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 6440 bytes
font_01_sfnt_off0000ed39.bin
2e233e2d136d741e2e6801c75b4b2390b2c7671ad96873bc20b98f4447711402		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 4948 bytes

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