Malicious PDF — malware analysis report

Static analysis result for SHA-256 11be067a91c81f94…

MALICIOUS

PDF

84.9 KB Created: 2021-06-15 21:06:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93f0f33b23beab3100b449599d0fa14f SHA-1: 853c12f08555ad7e9eca72af7aeada13456b2f44 SHA-256: 11be067a91c81f947a6f2877d2e9f2d236d8735e344e4ca7cbbd8398987f3077
164 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, potentially delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=anna+kovach+books+free+download
    • http://minerva-collection.net/files/files/23339223111.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ap7t6f02ag46jlfsj95k9n1k07/60429496673.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/iir8l01cqgk78dra2hkosfge89/bivix.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/i1ennh2hd7hj9c3n2j51b1d1bd/demoba.pdf
    • https://altonika.pro/files/fck/file/gugesagasuravazabusenobam.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608772c230c93---zupeb.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/pkdprfsqt61cm5cgddc3j8dp04/fuzuwokor.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5a97677f068780a5e08638eb8a01197e/50407751948.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754cfaa722b---tawiga.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0095033e6bc80c4207a86b066db7789d/15218684303.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/3a0fce51b362786813be0baaf14ed442/wilirel.pdf
    • http://brenno-tojestto.pl/userfiles/file/17020332315.pdf
    • http://safarang.com/basefile/files/3575395258.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e62ca101c4---2870741991.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/23imiatlj93f1k5lk6aup596io/16152012158.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce0b9291c2---80925552573.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db1.bin
514249d4b70ff4705d628206d2b1aa41c087c357fafd2c46d5f67028be374ff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 5456 bytes
font_01_sfnt_off00012050.bin
11e0ffdec5aad68367a1e63f0908ec1ba25fb6b9856b5f559969390061879fb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12050 11384 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.