Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea3b793d13af22e…

MALICIOUS

PDF

88.3 KB Created: 2021-07-23 03:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ec6bb52b482fcc4ed0beab1204755607 SHA-1: fb1551602006ef37092b572bae5fa7efc0a9f2f3 SHA-256: 4ea3b793d13af22ef7c63086999a6e596a770211d1a833c19d71c0938e986d63
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or scam lure. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hasici-pristroje-eshop.cz/files/file/35828301297.pdf In PDF document text
    • http://quick-thailand.com/images/uploads/file/50116011724.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608865dd7742b---26801083572.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/tomaraziwavinux.pdfIn PDF document text
    • http://qca.ch/userfiles/file/50782882979.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/f451b51daaa8ba43bab3c91ed112ebd3/zixukatij.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/xosegusa.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/gonuxepisibik.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/motebisutaniruzurulog.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/9881948956.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/35370509025.pdfIn PDF document text
    • http://jucal.es/images/file/88384875516.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/67d6ec912f9ef053af1605c3aee7687b/limudirewevovepogagaju.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/vudukorapegivava.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/67756680137.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/982063d9d168b528ef7ca0c0795683ae/70827399772.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca852f01fd---guwobowewuk.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/remafewu.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/58468483701.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/5f873a954874dffc81047bc6f7a47e28/21789359514.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/pitivavuxozipotozub.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0737327bb---xawuwajudoludedizo.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62920658676.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/0k675qjfrgioedslu1h7bcb6bk/vepedesavaterevawuma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=revalue+iqd+is+live+at+3.47+to+the+usdPDF 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_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 17368 bytes
SHA-256: f4a4495e2c2dd7c6dbf9cfea09d8aecab287783f7eaa5040a85acd277bddb2ac
font_01_sfnt_off00012201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12201 10864 bytes
SHA-256: e30db84dd62c41d05966e659c86dc07e8e50683ee52dc86bca80d498f00c60b0
font_02_sfnt_off00013b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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