Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8662831abd68501…

MALICIOUS

PDF

87.0 KB Created: 2021-09-09 03:16:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3cfc56db86e6340974dd12cdb081b2a6 SHA-1: 1cf4785af1d002d22b788da717393568409a8fd5 SHA-256: b8662831abd6850117ef03462b47f8830f7053675aa077354531a4570e792a05
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.beverburcht.nl/upload/files/dudunovat.pdf In PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/45276488989.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5v2p4qn1mhmmel8vhg7nalvhhl/91375250545.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346eccf0542---14712380381.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367dd45d019---96605237605.pdfIn PDF document text
    • http://24cvety.ru/upload/files/geruxoxoduzut.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/v3qua3dj8d9d0llc6r9v1jf1ob/kesoxo.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/87390057424.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354bdc27854---wolugisazito.pdfIn PDF document text
    • https://12tiga.com/contents/files/82352850850.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/vusizogajubijarimefalam.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/84762243140.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/xudujugonokaxijirag.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/37230518276.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/rasibejafaken.pdfIn PDF document text
    • http://szm.hu/userfiles/file/nijapadiwowoko.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/sonidenozuruxufofuzamanok.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/bbhg8e7rb4mglum58g8d2jva62/54206388525.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/refinodatibavutewopotenos.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/30015160224.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec31f6d16c---22811150053.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=elements+of+design+rowena+reed+kostellow+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_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 17716 bytes
SHA-256: 4f48b75a6b223e4ff34969e8318d2f4adf2ea98237e87dc31ecaa0b1e4568cf6
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 11000 bytes
SHA-256: 501087cbdbdabc4b4a49585f68127e658ab554b67b83e1cdf03f63294b942ea4

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