Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ea9948f84d1886…

MALICIOUS

PDF

80.3 KB Created: 2021-06-18 19:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 3e1d948ae5f3c8e44b71005f31561d13 SHA-1: 43baad7315489f89df8c4eaab08ea5159cea05a4 SHA-256: b5ea9948f84d18860aae2071b8ef1be3666913ebd0df7ced7dcdb78799b4251b
154 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, likely to distribute malware disguised as software cracks. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9238

Heuristics 5

  • 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.
  • 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://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f0ebf1103---xilijigegepulisajimebumav.pdf In PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/0242fc4d13deabef2ca88445e3df71f7/33167504463.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510083025416927453.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/ganilaripupukoti.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/3e20cbcc12104b79a9df317576a12e7e/45500517595.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/mobilotabesunibolo.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/88395091284.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d824b08bbc---19745954019.pdfIn PDF document text
    • http://upbfassadenbau.com/upload/file/78405132283.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/010d335204eee80381aeb2d01de9286b/79901169542.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d58240600---mozovituvevuvopukujozawem.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1ad58649c---34697363718.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9dfed43ecf3b506ca5469dc833e5c0e9/62992251650.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/gepedolusigojapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=acunetix+crack+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 4848 bytes
SHA-256: 1b264b693763e3b2968ee40cb6b46230d1d4a70ae193e7dcced877e6bac74e0b
font_01_sfnt_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 12460 bytes
SHA-256: 50984a817c86242e4ec92396167bae0b1951d71620aa77fac0884f10632464db
font_02_sfnt_off00011b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8D 18080 bytes
SHA-256: 32bd0c7121de69ec2b6c5bf753bf5fd37992dce6d5e6b89070516f01b2fe7274
font_03_sfnt_off00013761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13761 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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