Malicious PDF — malware analysis report

Static analysis result for SHA-256 8842555fad3622b5…

MALICIOUS

PDF

75.6 KB Created: 2021-09-22 13:23:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3a4127092dd4bf41021789e15c869fa1 SHA-1: 33689c7e4bc07160d00b3546b8b1ffb018306e08 SHA-256: 8842555fad3622b5f15f2cd69f29367e24c8a6068cf68c3ef1beb230a050e310
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://banderlogclub.ru/Files/file/xetudi.pdf In PDF document text
    • http://cachnhietwin.com/luutru/files/woparetapixi.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/futeza.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/90300634827.pdfIn PDF document text
    • http://dhf-china.com/d/files/dokelat.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/76782303564.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/rolenog.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147b48ddf240---vupavobifovanoxapupas.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/rexudolodojixuvugepemisem.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/14927921347.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/gh1r1hd1b4kji0hdafi0imipu4/lunupuron.pdfIn PDF document text
    • http://ahchala.com/img/file/26254854682.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3e0b184ca372192c4ae620f1553e7c63/36209974988.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/22623935581.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/20350736346.pdfIn PDF document text
    • http://fkhd.cz/data/img/tisizefibipaboza.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/76023100649.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/sabuvanupujuruna.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/tusasujavavatekuxexowi.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gusuvawanenegaseg.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/38270829057.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/47626358038.pdfIn PDF document text
    • http://gcsiva.com/files/userfiles/file/vejoputide.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=google+speech+to+text+for+androidPDF 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_off0000bc7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 19588 bytes
SHA-256: bfe80cefb63a4f9708e0beb7d775a531df6de368aac2ea3515bf7c49830be6c2
font_01_sfnt_off0000ef41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010758.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10758 11040 bytes
SHA-256: 910fa79fa667361f4d7d72972689352f83f6d929ac50ab5e41a09ae155b117e5

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