Malicious PDF — malware analysis report

Static analysis result for SHA-256 15f53461005d08f5…

MALICIOUS

PDF

83.9 KB Created: 2021-09-13 05:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4a9cda854ea321294b599fbe3e1d88a8 SHA-1: a36f5055eee49366348cb83777177421b6562b5f SHA-256: 15f53461005d08f5e7526dcefb87733aa94c0713229fd0a5fdd5c588b53af49d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of link farms hosted on potentially compromised or disposable domains. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cructi.ru/uplcv?utm_term=live+chat+mod+apk+unlimited+money PDF link annotation
    • http://agataklimowska.pl/userfiles/file/tuxidow.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/wupanogejexigutinipisew.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/pukolanabuwipaxaxemiforu.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a5caab718---bisate.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/13981806398.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/k7b82a7ef59ailmme4ged3fi14/45317469083.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/15020d6e4bf057c6af6d54380bfd3e63/22233797137.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/66859993508.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/migilukidusexixadojiw.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/mumevopesegedeleg.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/denofux.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/rudixa.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/kabiritemalefotutisulave.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gpkfbrvq1n70jkt4cq276kcar7/fofusuxigonik.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbe0dcf2b---36196125880.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138373918ad9---6314032682.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15258275584.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/41087363123.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136838c53d96---kasakebo.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/niwexomezugazuwolur.pdfIn PDF document text
    • http://e2ingenieros.com/ckfinder/userfiles/files/88901187967.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/78883798875.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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 17828 bytes
SHA-256: 8b1d705b6d3439a2fb9a970dc6ec73dab1af2c22f0a993156dfe694f22feb240
font_01_sfnt_off000110b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B5 10840 bytes
SHA-256: 783e9b872044acfadb311209e8564a6f8eebd015695ada113c5b27b2b78e93fb
font_02_sfnt_off0001298d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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