Malicious PDF — malware analysis report

Static analysis result for SHA-256 b067f54b8cf08d37…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 16:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3f258e2b51c08716f7d99126f241c9f4 SHA-1: ae2555c4cbc669f138cfa56c9a3150393fb81967 SHA-256: b067f54b8cf08d37690085eda28e6e6d5de5cc1abba3076c85820cd0d50a3fec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple disposable hosting domains, a tactic often used to obscure the ultimate destination and evade detection. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://vanphongphampmc.com/upload/files/34243980869.pdf In PDF document text
    • https://ibshospitals.com/userfiles/file/45365565504.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/pafobinaguguzakexajufo.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139445b835df---20322669770.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/6553503973.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/pudutujedima.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/87794795384.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/35399889918.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/kesesapop.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/58302555533.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/buxut.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/21298785757.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/71390080869.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/26187969027.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c272d351---fatarodosejutaxes.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b292d8a2ce---86302649424.pdfIn PDF document text
    • http://hotelbasantresidency.com/uploads/xajinirom.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xedipazosobob.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/39879341029.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/92600361425.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/32192346700.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/88877363287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ppsspp+need+for+speed+most+wanted+cheatsPDF 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_off0000bdbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBF 17144 bytes
SHA-256: 24be9bb7df0c763340e4bc0baefb38f155f87314e5c6a57ded29ec968487f416
font_01_sfnt_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10272 10832 bytes
SHA-256: 73cf556afea912fbf33bbde3363174b5ca12e2423532792d36205a05b413894f

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