Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ef4d3576a2c76ca…

MALICIOUS

PDF

103.1 KB Created: 2021-07-30 11:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e6f830c093c866ef6230b15fb53318d SHA-1: 0983bf2d68b2c84b2162c6d633896e832912277a SHA-256: 9ef4d3576a2c76ca51a5b365ebc260dd34180cd200df609f33fb9dbed8ca8297
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://medvor.ru/uplcv?utm_term=bazooka+bas+r%C3%B6r+el-serienn PDF link annotation
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/4733470390.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/74025593481.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/96991206888.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/8e5klbe7feu66am50t20p4r5g0/denuwe.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/furapawijegokimubiwaju.pdfIn PDF document text
    • https://istanajp.com/contents//files/jikopozafuz.pdfIn PDF document text
    • http://timapools.com/uploads/files/482860706.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/46oo49umrsk8la9jm4977eiblk/vewibarizagivexiwu.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/niruxabemijavewarasana.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/29008803595.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/44374450976.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd8d9b6b48---jawolofenolubef.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/fuzexobor.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/75296384359.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f57aa62f6---42502247054.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/rusotomo.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1622019800.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071f53c2c4e7---77543415099.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d274826078---25816793146.pdfIn PDF document text
    • http://bluefield1966.com/clients/26642/File/rurawajugumesetune.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7910accbeb---nolowogudizopopodanize.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b24622b952---vekoduzikati.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/ksjnme89mdvedtfs8o6ob3ph97/demumewazotulofagizej.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/95b6cdc4233174cce931572d6c1f7be9/90048897784.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_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 10596 bytes
SHA-256: 1eb89e2f6ecd66a02a0966ae3c7b197e7db4a46d91feacb18c1fa17cd96e1ef1
font_01_sfnt_off00014152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14152 20176 bytes
SHA-256: 64891ccae19317095ba97c1ac8394facc05eb401f81d73503f52863a2137e24e
font_02_sfnt_off00017571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17571 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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