Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e50be48629fca9b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 17:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 057592eb54e1c284f1024a9c43fbba4b SHA-1: b93edac98a2d2365adb79b579db9dddd773a176e SHA-256: 5e50be48629fca9b5913075cb6957963e5ad04378ee3c2e2d686fbde572ada53
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further payloads. The embedded JavaScript is likely used to facilitate the download and execution of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://allytemp.ru/uplcv?utm_term=auto+screenshot+android PDF link annotation
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/motizot.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/fanizipotapatoz.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/rexarolavefupepinekujoga.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/23311599867.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/710c4fd96dd3adbd0c1b384677dc2392/negef.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/fn8r3pkmk975ss75ahsegdf919/rodidufarejivov.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/lafusuxozomudapureg.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/881199317.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/1962051031.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109012214279122.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/49219208432.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/43128940012.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/it1aumpt0ou982pk2c43v0u1ke/galefo.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/rotuvojozelikurunidipevo.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/vobunakulefizuget.pdfIn PDF document text
    • http://leebyenghun.com/new/upload/board/files/58053456448.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/14161910208.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381cf006f0d---disuliwefelup.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/5854504104.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/33577636257.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/xenovivik.pdfIn PDF document text
    • https://insolite.lu/img/userfiles/files/48652382882.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/23053782514.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_off0000cc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC69 10500 bytes
SHA-256: 172205c25e87fe7c6816aacbc60b2bb671a524e9c415c0ffc1868dabc9ecefc0
font_01_sfnt_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5F 17608 bytes
SHA-256: b33ef584728cbfad0c3094441495b7aea65dffe688e05070df9f5882304b4a36

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