Malicious PDF — malware analysis report

Static analysis result for SHA-256 2066dc6140bdb8c8…

MALICIOUS

PDF

70.3 KB Created: 2021-10-08 22:17:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 40a7f98686ba35c0403eda9a198f5a5e SHA-1: 99cd42b4a2f10753ee0c4d9f679953295d8a81b8 SHA-256: 2066dc6140bdb8c84d416ba9e11c010b05f84b21f77d4b9047622a86c19f6dfc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URLs, many hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://oniceh.ru/uplcv?utm_term=titration+of+na2co3+with+hcl+lab+report+discussion PDF link annotation
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/aaeb732deab36fdc725c7b792b34277b/36334101301.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/87338215894.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/179c814d216266ed5fda097acf2f72a3/melokare.pdfIn PDF document text
    • https://autoskola-scp.com/files/94212326183.pdfIn PDF document text
    • http://sakem.org/userfiles/files/45526729290.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161466051f2f70---nonafozuj.pdfIn PDF document text
    • http://yjeverspeed.com/userfiles/file/dujatarebukod.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/dujubowa.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/zemujavadizafaxolus.pdfIn PDF document text
    • https://hsse.cl/files/50213184055.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/37123395377.pdfIn PDF document text
    • http://charontrade.hu/data/file/suwamatelozusiluzinopu.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/gabowuminemanuwogesujuxo.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/50726933925.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/rokizewafafazoga.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/7233909565.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/xaganoxipibakumomedi.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/93427739806.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/66672865232.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161406efe3e4f4---70829988865.pdfIn PDF document text
    • http://boden.boj.se/uploads/userfiles/files/nigefifivazapasabidumule.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147f30799f74---pejufeluparo.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/zunigifodolefa.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/xezunulo.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/28661183898.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/sodogelanugebopisezefexu.pdfIn PDF document text
    • 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_off0000b43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43F 11300 bytes
SHA-256: 15356af365e3c96e5d72a371f46f4a93a61344fecb984e2291a39c84f267f715
font_01_sfnt_off0000cead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEAD 14828 bytes
SHA-256: 16b7f9eb3c13dec721f595f13deb714b91bcb97e3bcab01487e15187ce929a1d
font_02_sfnt_off0000f39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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