Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6dddc03e2988e6…

MALICIOUS

PDF

75.8 KB Created: 2021-09-04 04:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 48c72ce5a57a80b21ce52bcf6b8283d6 SHA-1: 5dba982a79b3b9209cba4acc98aca9e788521c4f SHA-256: bb6dddc03e2988e610382e243122156ca7adade7815fa4c25e5cc3b73af4ba5f
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is likely used to redirect the user to external URLs. Several heuristics indicate the presence of link farms pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The embedded JavaScript and the nature of the URLs strongly suggest an exploit or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://studioaba.net/userfiles/files/wufivarujemavikosakego.pdf In PDF document text
    • http://wenxuezj.com/images/File/13363489804.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/23395816294.pdfIn PDF document text
    • http://partnercable.hu/files/43284683330.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/c88e32d507c53973e4ed481a1caed9de/63134577605.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/fa5moh5gmp6f825vvf4mq95a0e/79095776553.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/sdjalbt165rclv5e07r03gqpjq/58227458641.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d40bdc107---foxadiwof.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/b19909f7d515fc95be509d9a2bb5f62c/netojerilejozidox.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9acfb773daad477a0a3cc3bdeebf7b61/61023595211.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210609_56553E5CB675924F.pdfIn PDF document text
    • https://istanajp2.com/contents//files/zatubag.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/6ddf9fbd1e9093845e80172b0520e728/mevodojuzizew.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210708090537.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/sifekazok.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/72230703287.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbaa756911---pevekev.pdfIn PDF document text
    • http://cn-daomeng.com/upload/userfiles/files/835d9cddbb7098a8cf0efad3f144f48f.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ba82686864ee968403bb756404bcfee9/xogiso.pdfIn PDF document text
    • http://dichvuhangngay.vn/uploads/image/files/51720204854.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160819f0cc9659---sigupeteguwegubi.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b2fb728337ed99649d556a99fb5e7e21/netanalikawepijunizoraj.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/7849033874.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/18635642324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=grade+2+mathematics+workbook+pdfPDF link annotation
    • 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_off0000c179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC179 17592 bytes
SHA-256: cce555b9b6f9bbff55224adf7a95ef73c66469158cc89ddcc3744ef0cf9debaf
font_01_sfnt_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 11212 bytes
SHA-256: b3efbf31d0ccceb1eaaa1e8f4c5f6a71c3ee830551e67b2d6fa636ed7a87e714
font_02_sfnt_off00010990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10990 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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