Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b74e94e5c7c8ce3…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 22:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 082263d309e03253df9bffb8a8f6177c SHA-1: b74541aa3d62de3f1465d835a164baed489a2b51 SHA-256: 4b74e94e5c7c8ce38de76d86a2f8412dddefb4e11ced1cbf08ce72321c36c4b2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple URLs pointing to compromised WordPress sites and disposable hosting, disguised as shipping documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://drafthe.ru/uplcv?utm_term=ups+freight+bill+of+lading+pdf PDF link annotation
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f7879fff5bd9f30a816027786114b234/24334517611.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ad32e713---kuzojajobifaweje.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/wemokiziwuzesovux.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/88867620533.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/62356495973.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/38617587686.pdfIn PDF document text
    • http://apsons.eu/files/file/xarawamopo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c55f3ca7f---78559949092.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/21tn2t5eg55mdjhpgmvhuqdud1/90577015992.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/jelar.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e551b40058---xasegogafagu.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/fuzojalunu.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/57933426738.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/71602887426.pdfIn PDF document text
    • https://luminex.pl/upload/file/tasoxexevobo.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/jalusekunikitemob.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f49ae1f772---72592268404.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/34439055968.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/92219289085.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/76084914070.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/kiteka.pdfIn PDF document text
    • http://atomleasing.ru/media/File/lipudofexelasana.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84112b6818---nuzarutasotiwowofekenesu.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-26/2108260059221879499igtyxtmf3e2.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_off0000ee02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10614 18448 bytes
SHA-256: ea1866759e7f2979b1e5ee2c20fef6adfd5ecea9ac2cdb0b5d596c1d57eb2d87
font_02_sfnt_off0001366a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1366A 10924 bytes
SHA-256: 393d9cdb87de0982e7520be31f1346cf10b9ca2794aafe9c571c10f20c8ef0df

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