Malicious PDF — malware analysis report

Static analysis result for SHA-256 d626cde6aac730e5…

MALICIOUS

PDF

82.3 KB Created: 2021-09-16 22:51:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f5bd0659014dca01f0475c216b92426a SHA-1: 0a812f94034c4fae5f05f42515bb040eb86f8db4 SHA-256: d626cde6aac730e577252da67fedc48308a175559e93916abd7f84f921722b36
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to potentially malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nepaltrekkinginhimalaya.com/assets/userfiles/files/bakorima.pdf In PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/44901371114.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/bokujotax.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/dogaxel.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/47509305512.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/14759461260.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/fifezigiligevabivixojuka.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/94971550104.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/vewatudedufebomavinosefo.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/48697177695.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/39565518270.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16136fc103ac05---nipabonibefibegok.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161351af88f4ef---rojavivazewusalajupinivez.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/43314125964.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/39732789604.pdfIn PDF document text
    • https://n-tlg.com/files/file/46031919820.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/fe2e409ee7a8a55cc39d554b8f719fa4/10417980726.pdfIn PDF document text
    • https://mbbs.hr/files/25696538718.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/bagufibowuxupo.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/pamawedagunet.pdfIn PDF document text
    • http://gu-bo.cn/uploads/files/65040338639.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/pegefiguxawonetonunufaso.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/napaw.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/2u807hcb3ced7k7jrmumo74bt2/59348353145.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210907150359.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=bowie+isolar+2+tourPDF 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_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 10356 bytes
SHA-256: 23631e600bca92ffc8c0ffddcd710b778ada38d5ecc894ef8ec84222e8ee8e0d
font_01_sfnt_off0000f482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF482 17928 bytes
SHA-256: 1b8aa5dea8f1f86109a66d9405441e557715c3993b4cddbf51cebfcdc6675310
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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