Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd8674a8fb7a3db…

MALICIOUS

PDF

74.2 KB Created: 2021-06-20 21:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 331799579912455aca10ffc79faab62c SHA-1: bcf5cf1471e65c6c6b859816fe32c96137823574 SHA-256: 9bd8674a8fb7a3dbe11abfee4d8607d0650b7259f10dffcb74c1b11761e13826
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting an attempt to distribute malicious files or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/60a6499ea741897de496ab12d6998228/90091754669.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4ba2415f8---ziravatuzutitaxajez.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ba1c3627b---11738109819.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716b4ee9bf4---subujilabuxegose.pdf
    • http://nomorecpapmachine.com/userfiles/files/werezimabojis.pdf
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c01e45991f---xositenov.pdf
    • https://alice-immo.com/userfiles/file/35259550483.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608085b7ea67f---19970628729.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/5c673ad91fcf851d9aa736069eae7ffb/50092101720.pdf
    • http://langfordfinancialservices.com/userfiles/files/vuvisaf.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6ec1j7dv4l2r4g8n2i54ktau0k/67903897978.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/60d90de2f495f8f2ccfefa093758423f/furebok.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/449ffccc3c2c1f8cd09ffb5d4a92806b/savabogozejupifezep.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/jofd37jttg8kfl3i66o303vtou/70607988352.pdf
    • http://mega.kz/media/upload/files/weruxanarok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bin+mangi+dua+novel+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c656.bin
2159401498a95d9e110856cb7242dd138aeb3e32537b76e37f6f8f3d3c8533d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xC656 4872 bytes
font_01_sfnt_off0000d6c0.bin
c1fcacebbd3d0623f4c223f060a392bd222e993189893441543bc1ba3c1406e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C0 6912 bytes
font_02_sfnt_off0000e975.bin
ba49d2496043382a75163dbeefeb9ba341b48ee36aa9a9b88d95b261302f9f3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 10640 bytes
font_03_sfnt_off00010dc0.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 4324 bytes