Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2cf428c3d38e3c…

MALICIOUS

PDF

71.7 KB Created: 2021-10-01 06:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7fa3c8899d576b5de277e221fe0774e1 SHA-1: 6b4da1912ec1324c0c9965d2051ce2e7f379fdf3 SHA-256: 5d2cf428c3d38e3c40a9ed7f6421a3b31020fe0caf378e5f9727358efd35ed98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these external sites, potentially for downloading further payloads or collecting user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://infrive.ru/uplcv?utm_term=world+no+1+cricket+game+for+android PDF link annotation
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zifomurojojepagiboja.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210916083405.pdfIn PDF document text
    • http://reestr.fgosvo.ru/files/files/16783789854.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354544a77f2---galuwutumuzidaso.pdfIn PDF document text
    • http://modero.vn/upload/files/23338700790.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/46351601707.pdfIn PDF document text
    • http://yuh-tarng.com/userfiles/file/56379966455.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/54672724876.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/kafapopenapabe.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/tegorosa.pdfIn PDF document text
    • http://wenxuezj.com/images/File/tuginanoti.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/lemiwubodo.pdfIn PDF document text
    • http://electric-kernbichler.at/40389925809.pdfIn PDF document text
    • http://msiutilities.biz/documents/2765135141.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/xadadutojaviv.pdfIn PDF document text
    • https://ibericadearmerias.com/file/kejurozusedodekedo.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/50651899177.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/tadozumavite.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/sosulagufezugijek.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/ponuzonufotago.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156428e4d708---govejozedo.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/87691051148.pdfIn PDF document text
    • http://malifer.hu/upload/file/21964254801.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/pawenaze.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/19193342687.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210906002539.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_off0000b556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB556 10788 bytes
SHA-256: 2c40a649eabc09aea267504ffdd72dd84abc2d207f1190ba45384814b82ded4a
font_01_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 16756 bytes
SHA-256: a22c32e0d14395e39ab5191bc121519f58deb8f9a22a18cbce35f05f19c776c3
font_02_sfnt_off0000f86f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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