Malicious PDF — malware analysis report

Static analysis result for SHA-256 329d0930f65d03c5…

MALICIOUS

PDF

74.3 KB Created: 2021-09-07 02:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a1080aefff519d9cae0772e1ed6530a4 SHA-1: aefbbff52dfbe009122b21f2fb5cde03ebd88b0c SHA-256: 329d0930f65d03c54b6578f63a8a2e91b909b955a1d09c36c91f11abf355798b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm, with many URLs pointing to websites that appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on potentially compromised sites suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • 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://renebeumer.nl/userfiles/file/zinagarupejuj.pdf In PDF document text
    • http://englandmatchshirts.com/assets/file/95862857387.pdfIn PDF document text
    • http://mobilenmr.com/files/files/40718727877.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b02042dce---98889364742.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/87912532656.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/42374854435.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78058087864.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/kegegazisobume.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b33ff36aaa4---5433210899.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/2rlfeveaj4g737qukjmh6g1qtg/tavipuvikunakabax.pdfIn PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/runeriwadusonutituxate.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/lebowezejojuf.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/19a967f299f8205147de89e5bc34211c/26312794489.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/visotipovakagirugutugija.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b585596c5---juzaso.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094abf7d2f7c---zomiseguvozukezofupaw.pdfIn PDF document text
    • https://tipresentoio.it/images/file/14721138229.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/mukufosamife.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/34786669773.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38eb95b95---mowajomavajolefat.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/wutasewularir.pdfIn PDF document text
    • https://rinducm1.com/contents//files/vevowatupetujumona.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/gewajosufeni.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/55181359610.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=community+law+manualPDF 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_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 10200 bytes
SHA-256: 48a045b47f17c8a4fa0ff30914609ddc6cf20f97434cccd66c97a59f609b99a6
font_01_sfnt_off0000d73f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD73F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 17288 bytes
SHA-256: 21cd1375dcbca8007c3fe4071e7f35100c4c3b3f797b23712e08a0ccec03283f

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