Malicious PDF — malware analysis report

Static analysis result for SHA-256 071e85d498bccf9a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 16:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: db027ad92eecebe8b64afbaca61bf2af SHA-1: 3480f2a73b15263248a92f13b7b46699f7b6a05b SHA-256: 071e85d498bccf9a132aa49c3e0bb0de0ea03b269a3d5af8e36bddcd25147506
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate a high probability of maliciousness. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to compromised WordPress uploads or disposable hosting, suggests a link farm designed to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=keyboard+hangul+android PDF link annotation
    • https://estatecambodia.com/htdocs/cljr/data/files/14782618257.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/gujefimoxawez.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/23661636469.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/92572847273.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/81434574114.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/410533143e774b04accb251058b0b567/xogulafatuzabenog.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/d8071dbc315c22cead57efcc45ce2756/salexazux.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/xasudorulopewipumisibiwu.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/81645871076.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/parijimejobowadoxodexo.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/68689882840.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/72939492073.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/88918766157.pdfIn PDF document text
    • http://pjteam.hu/uploads/tiwoxazalegalesewubo.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16138a41312603---wivagosagakerotirileli.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/6615075947.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/bazajabopare.pdfIn PDF document text
    • http://secoinblock.com/upload/files/96178758382.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuwirofudevof.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/zidalijosojagaguvuzolo.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/67207225135.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/tovujogavanilumokivo.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/sidoxonegedesizekap.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/15825657120.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/39089049800.pdfIn PDF document text
    • http://branonperformance.com/ckfinder/userfiles/files/94951637804.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_off0000c762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC762 10608 bytes
SHA-256: 19ed1b39e050807636efef280253f6a575223607eb7db00dedea1b0af3a82067
font_01_sfnt_off0000df40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f752.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF752 18264 bytes
SHA-256: 537327acd9447e844067483af58d3ac1ae2bf5e39b6e2bec5ce6587fcfffeeec

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