Malicious PDF — malware analysis report

Static analysis result for SHA-256 30831a7795f1b925…

MALICIOUS

PDF

80.8 KB Created: 2021-08-17 08:35:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 28f29d85b9a5c4c64c7d625ea17b4aad SHA-1: ab9846ee3fd1d863e69f6dd61b729b3c6ec7eecb SHA-256: 30831a7795f1b9259985445ad52b326fbf9ac6b28b23ee73e2e18302cf232703
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as a lure or redirect mechanism to deliver a secondary payload or phish for credentials. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ristovski.mk/public_html/upload/userfiles/file/gasepi.pdf In PDF document text
    • http://norrlandet.se/userfiles/file/94953294345.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f6eff6737a2---memapugoxemuvuket.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e8bc8a350314ee88563a01f203ed66a8/gatanovozazutigije.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19e651fd5---34953626734.pdfIn PDF document text
    • http://susutour.com/userfile/file/35653158861.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/a564af67878c85b48b7e1eeb12ce17c1/37255344811.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3e257d05880813bb0950009f6e5f2afc/22033178754.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/cdff0247dca679c3ed51e931e8b6ab3a/72909514546.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/87404212491.pdfIn PDF document text
    • http://carscaso.com/js/upload/files/31063440980.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/fejige.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/11643721183.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/rasevarojuwaribavalefuve.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/e4c3e4c3d2bbd8072f8d39d9ed804e83/3929625914.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/93572759511.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/58394508863.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/8651031588.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/vilenokubitonajeroxukege.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/gutr1e9l84khmjrh3vijg6rkf9/67267948462.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/45445507174.pdfIn PDF document text
    • http://msiutilities.biz/documents/tesimuwa.pdfIn PDF document text
    • https://clove7.com/userfiles/file/75370323046.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+get+i+140+approval+notice+from+uscisPDF 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_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 11316 bytes
SHA-256: 7ff2447235560ba2fabecf4d3347756138459c56c724f20a4628162986a8b5d7
font_01_sfnt_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 16448 bytes
SHA-256: 48226738a2fa5b91b5ebc454392fe301f39a4460c7d85f0f3f9682cb57aea2c1
font_02_sfnt_off00011d48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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