Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1cd72c85eef5ac…

MALICIOUS

PDF

85.5 KB Created: 2021-09-09 18:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 60993a28a22d487496e70dd0891a0ea8 SHA-1: 1a386381908a850cde2da8bd9ff841d2991daaba SHA-256: 8b1cd72c85eef5ac9a49d98fd6d696c44dab49bdeb1ddf00ab059ddf9e61fdf4
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The PDF also features a link farm pointing to various URLs, some hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://atsolution.org/userfiles/file/20210908113334844461060.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613188b8ed673---jozutuxoxibadizuboru.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/10163012266.pdfIn PDF document text
    • http://energosol.pl/images_cms/file/45224219435.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/fisobowivibozapabivoja.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/76561610057.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/22161279237.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/8698575079.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/amdpe4acnmf0f6ck71vh1efmj4/65466760378.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/zubupinufesunelujesuj.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210903_100E11DC7E708D68.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f8c507ec6c72ec74fbdb44bf473503f0/52012446399.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/vozazonola.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/57786561094.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/93139947349.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/46354981165.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/zedaviwi.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/zitosonurelugijudaxiri.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/14625852435.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/97211309319.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/90085282168.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/24523360260.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/4565040871.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/65082051694.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=download+game+naruto+senki+borutoPDF 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_off0000e53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53A 11008 bytes
SHA-256: 11b30165bd93c847df416b0a70ec2eaae3f960f0e03a197a006975170dce2653
font_01_sfnt_off0000fea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 19144 bytes
SHA-256: 58a1e08641a7415314d00c966c5ac6652401bbd074d4fd5f3a158d5462b034fa
font_02_sfnt_off00013076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13076 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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