Malicious PDF — malware analysis report

Static analysis result for SHA-256 55106447f5ce0758…

MALICIOUS

PDF

82.3 KB Created: 2021-10-06 21:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0072d35518b03c0185fc1400e9199ccd SHA-1: 324220acc3df2172068d6ae127f064d592d5b387 SHA-256: 55106447f5ce075873360b38bc5d81b61a880cc9bd8d0f34425129a8d8c12132
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and disposable hosting. These elements strongly suggest the PDF is designed to redirect users to malicious websites, likely for phishing or to download further malware. The ClamAV detection and ML classifier further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=pdf+recovery+freeware PDF link annotation
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151a1f520cf1---88523145664.pdfIn PDF document text
    • http://thermocomfort.ca/userfiles/file/10967986989.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/20648474757.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/30161305874.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/9458966550.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/24795693369.pdfIn PDF document text
    • https://peisheng.org/uploads/ckfiles/files/61342925b3577.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/tupemitod.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/39349819795.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/jefolegimikuwavaref.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/68634949588.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/25950662050.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xisujopi.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/zabikulewu.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fefegininisu.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109270521034073.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/99199231231.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/14398441055.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495f3ef0930---31237925573.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/velibojebevafipomuki.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/35447915561.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/95716999812.pdfIn PDF document text
    • https://podimercrm.com/img/files/gubazowijaguvegegesa.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210903_53E4487F07A5163D.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16152cf1ab0921---xivozavalipe.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_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 10228 bytes
SHA-256: 11922d704fd0c7127c3cc9aeba781d84f8696ce56790f5236a7c5b5d635a1df3
font_01_sfnt_off0000f29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29D 18452 bytes
SHA-256: f434271292b8af78263f121152f2ca4033241f5648a884c9ad3f4cdb51c8994d
font_02_sfnt_off00012339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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