Malicious PDF — malware analysis report

Static analysis result for SHA-256 b232813db613794f…

MALICIOUS

PDF

83.1 KB Created: 2021-07-30 19:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 2677f5ac8bc244dea11fd3f8c364887d SHA-1: 03d97a63c217de15d92d9fb7441ae9d6465432e3 SHA-256: b232813db613794f92f2e711cce2f562f10ed1c1d3227d419b37390aea5b2263
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.rougeindigo.com/ckfinder/userfiles/files/4313740989.pdf In PDF document text
    • http://capitaloffice.pl/fotki/file/fovitavozizaladipotureb.pdfIn PDF document text
    • http://wujipacking.tw/upload/files/74807812889.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/xadixivipemepuzonolom.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/61842252026.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f00d0cae53e---lupaxor.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bf4794769---37932418300.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/545ca8895af4675f89536728242a9cd6/lekesegoretivenofopego.pdfIn PDF document text
    • http://evola.it/userfiles/files/19958963822.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/208sd3csd9bdtinj1sf17ghek7/tuxivusedolukogawak.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/sezimixisezulakiv.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/2063008718.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/2923331907.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cb79sob3gok9nbf6vnqe46ndn7/35754279464.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/rorumalemezagokudinebasip.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7dfca9791---45294193175.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b56abb5a8ec---binolokiforufokofekow.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/0ce5b7b81b98f3b121455ae07e394615/liketasadojisegawavuxogu.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/rusirasadegani.pdfIn PDF document text
    • http://bscartridge.com/pic/sozoxawamiwuvab.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d30815c636---renamobukopukumerupejufi.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ce2bc1d19f43cab78a2e003a3852842b/savejabemevunagenomer.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vemonubigezoke.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad6e9fd64---firafagutunojikatepezeku.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/dunapupesirekibetipumuraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+m%C3%A9todo+arban+para+trombon+pdf+gratis+espa%C3%B1olPDF 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_off0000db95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB95 17704 bytes
SHA-256: d73e09c69aa23ad7fc5e01b8bc7856186b0acb21dabe5b48c2839986aaa56637
font_01_sfnt_off000108ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AE 11464 bytes
SHA-256: 1164ecd4534d9f51842537c86fb166f9f57329280fff32797e0e50e4167164b5
font_02_sfnt_off000122ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1