Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb43a99e859082b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-14 09:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06cb43a2c1d9bc83a59d4e3c1301eed7 SHA-1: ea3837e64e99821c89df7a4711850a98b53d39a5 SHA-256: cdb43a99e859082bd5fdfb4519f477194544ac27d3bed774cf0b48683ec84b05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting sites, likely to distribute malware. The presence of embedded JavaScript suggests an attempt to execute malicious code or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bodymason.com/user_uploads/files/fabazopajuwokifuruvo.pdf In PDF document text
    • http://deepakbatteries.com/uploads/file/xedajosonejafotufopemele.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3d6684ec6---31385844182.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/52685196935.pdfIn PDF document text
    • http://methese.com/upload/files/72180750877.pdfIn PDF document text
    • http://hairtransplantmangalore.com/uploaded_files/userfiles/files/57769797285.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/nigakanoxuwe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe3257202.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/15589173850.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/85249089322.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210913235243774968lf3tge.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/56422289603.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/20527800041.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/27904545721.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/fanafawapatinematufuxu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/54bcf43ba8de080ab29ff0595539cd81/duxufej.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/2166482001.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/fegamasisowozine.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/wutufogixoluzufaxuri.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/mijazukovekakirasuvasenol.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89811641143.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/joruwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=botnet+app+downloadPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/88685877424.pdfIn PDF document text
    • 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_off0000d5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B4 17240 bytes
SHA-256: 29c80241986a7c604e8f74ce71848ba95ae3867a4281170094c2903a6efc90ac
font_01_sfnt_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 10164 bytes
SHA-256: 038544ac14204585b400deed3aa86e28a0989707df1323a35ac7fe781d497003
font_02_sfnt_off0001191f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1191F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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