Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9d1759da7bcebe6…

MALICIOUS

PDF

69.9 KB Created: 2021-10-01 03:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 629a9343172f9fe9db5bee215856184b SHA-1: b6550d3c20df6f6191f297e34b9ffaf043abc601 SHA-256: b9d1759da7bcebe6d4ba180d96d91da85ae6e44b10594b131287d7af024cb05b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement with the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cc773e319---18612283527.pdf In PDF document text
    • http://dancephoto.ru/userfiles/files/35450466231.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109152333456696.pdfIn PDF document text
    • https://www.gullyracing.it/admin/ckfinder/userfiles/files/lumaxe.pdfIn PDF document text
    • http://xaydunghoangthanh.com/img_duhoc/files/64324298082.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/423071808.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/88028783006.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/notovepupoguw.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/85727766575.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132da717dd42---rozetemekegapo.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/welulasid.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/dufirid.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/49149405770.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210923214857.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364952e3bca---20237222352.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/vilusevupumaribadi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16130355e0647d---47840539896.pdfIn PDF document text
    • https://stephankeppel.com/userfiles/file/76727978148.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cacd5ad855---rikodimovukifoza.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109201549161786.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210919150239395.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/17222857116.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=find+stored+wifi+passwords+on+androidPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/542240920.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_off0000b267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7E 10508 bytes
SHA-256: 989b06396eea055fdab4f7722f127256dc34f535a5c8c9645092cf76c2a221eb
font_02_sfnt_off0000e293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE293 15392 bytes
SHA-256: 2c5076c6edda14aa56fd0d1b0097d30690aec43a792c31272969e818e0131135

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