Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c28396ec1badc5e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 14:15:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f7456b2dfcccbb29a987adb4180c52f7 SHA-1: 872ad2948f5523e24574a308decc4a138a3abbd7 SHA-256: 9c28396ec1badc5e01e07d5d1e9df059ad3da9edd2758c6adff0c96f9f0ec8c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://wastran.ru/uplcv?utm_term=hack+a+wifi+on+windows PDF link annotation
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614de61eb6e4b---kobunidepag.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091418000173499.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/xomemesigeme.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/lotijolupiloroju.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/65856549582.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a7475b41a2de781059a195a9fc319e94/23447399119.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/jexujovugadibalakobinomu.pdfIn PDF document text
    • https://unitjaya.com/contents/files/sefemofudobupetujaxoj.pdfIn PDF document text
    • http://debten.net/UserFiles/File/31456087740.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140157383aa5---zawiwiribivivutadoxavex.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161331fcbbe615---gasaxaxapavo.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/dusededudosodij.pdfIn PDF document text
    • https://nsaimmigration.com/userfiles/file/verivemimomereluf.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/sitetogovonitoxu.pdfIn PDF document text
    • https://salondumariagededijon.com/userfiles/file/43692264977.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/wimivedefav.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/28699960032.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/faxekozikotebanibexeka.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/46497029916.pdfIn PDF document text
    • http://yujinpharma.com/upload/files/jugudavijiluxivaza.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/nabupumilaxijijefumef.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/vesefirixupadekefubiviko.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_off0000b021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB021 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC833 17696 bytes
SHA-256: 53a6763831c05247c17be52bb9389504871953a7ddc75c595a90c422d94dfdbf
font_02_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 10260 bytes
SHA-256: c4c98ca94b477c5a09665cdcc4fc46374f2d3aadf8236c4b151c99229febc871

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