Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe433b406a6c93b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 00:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a13821814e584688281566b05f558e0 SHA-1: c5460670415a059b704884dcfab33733d1e68b8e SHA-256: ebe433b406a6c93b6a586d3a8a6f66367eee0282733fa97e49ef1eaa85b61b24
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable domains, suggesting a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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=how+to+clean+data+usage+on+android+phone PDF link annotation
    • http://mixline.ru/img/lib/file/14274075793.pdfIn PDF document text
    • http://www.bandungmesin.com/file/39971029960.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16148f65fd5843---50955724036.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161312e8934d98---duzasixolakesuwujokun.pdfIn PDF document text
    • http://0228339500.kad.tw/kads/ckfinder/userfiles/files/xibegufexerinojilixen.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/a0octme8h9188f6eqs2e701rt1/90719185869.pdfIn PDF document text
    • http://analhospital.net/file/files/4907471255.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dafufoj.pdfIn PDF document text
    • https://insp.biz/img/file/3303008230.pdfIn PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/dofovivom.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d10adf3a3a---61954931899.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5a2af8eff7226ba485737c0c4a6d9d51/juwomixesutabakepijav.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/zaxefubewigar.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/82967898200.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/makujo.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/fiximewuxujonomov.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/61896895478.pdfIn PDF document text
    • https://kaimano.it/file/ligafubajasizo.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/wafosijisotelezibo.pdfIn PDF document text
    • http://hstechno.com/userData/ebizro_board/file/22364309290.pdfIn PDF document text
    • https://expomediainc.com/upload/file/97855168140.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/fajirawovirufi.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/belepezapezogapigonosoxes.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/9348206556.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_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 17916 bytes
SHA-256: 69915e4d43fdc3204425bfaaa0c227e71ea77b2afd4d4d290b32546d209455d8
font_01_sfnt_off00010fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCB 10968 bytes
SHA-256: 2da71296f9cdbfb9fa59d339fa6c975bf2f839d981a7a79f0cfa1639bdea4906
font_02_sfnt_off000128fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1