Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b04cf64548abf91…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 21:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ed8138177ccfe34fc03fb52571839d31 SHA-1: 74047f449b1e0864ab6f7029d57294891e8839c1 SHA-256: 7b04cf64548abf9141fbcd3ed45ae428398712c67ec5d333ed1b3771e8b9928c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous links pointing to compromised websites, many of which host other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phish for information. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o76if5g8iis4cjvjfaljqmcddv/dobijukiwirijudulad.pdf
    • http://e-park.es/img/uploads/files/bexivigibozepalo.pdf
    • http://geoman.cz/data/file/sisajudopik.pdf
    • http://abwninemile.com/uploads/files/15053612551.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161355c0626477---nowuji.pdf
    • http://straub-online.ch/userfiles/files/badimusugogexufepi.pdf
    • http://mbjarrahi.com/UploadedFiles/New/file/21390927270.pdf
    • http://ph-easycome.com/userfiles/file/39493641760.pdf
    • https://thucphamtruongxanh.com/Upload/files/44488179299.pdf
    • https://virtualpulse.eu/UserFiles/file/26553007103.pdf
    • http://turnyras.lt/Files/file/20479429514.pdf
    • https://www.bankkartya.hu/js/ckfinder/userfiles/files/98201455645.pdf
    • http://patroha.hu/file/tawivedenumumesiluxulada.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/aguolb64kvv3v990j9gsodukag/17571391649.pdf
    • http://nesemlak.com/test/images/uploads/files/mukeruse.pdf
    • http://zjqzzx.com/uploadfile/file/2021091211012273499.pdf
    • http://net-marketing.hu/images/files/jelepujavipo.pdf
    • https://viettincapital.vn/upload/files/68923839792.pdf
    • http://myrbacken.se/login/ckfinder/userfiles/files/zezobemigebiwagoxovepuke.pdf
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/77366860812.pdf
    • http://ibookingkr.com/FileData/ckfinder/files/20210919_53670B38472E9302.pdf
    • http://udaybharat.in/ckfinder/userfiles/files/78958165908.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cara+download+lagu+mp4+gratis
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000af6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF6C 16792 bytes
font_01_sfnt_off0000c783.bin
b47132eecb7347e9dbd8bb0eabd338af2425633e79ae3d432c998d767b2c4d39
pdf-font-stream PDF embedded font (sfnt) at offset 0xC783 10900 bytes
font_02_sfnt_off0000e090.bin
e42180055ca098b453e66b5cfa1840907e70aff1e614e582989ad31139b1a6d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 17740 bytes