Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63646c8c98f340f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 08:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8825620d105cbdbfd848f12e87123178 SHA-1: c34130bfead405cf9e9ea31a50073cb26b8bd4e1 SHA-256: e63646c8c98f340f9859200941f9b978fd3a01c3f51add4f95589b0ab55a86f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://huntic.ru/uplcv?utm_term=pokemon+3d+offline+games+download+for+android PDF link annotation
    • http://rootbeadmill.com/upload_fck/file/2021-9-10/20210910120944556742.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/63572316592.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375ee371522---jiruforifemizetukaj.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/39131155900.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/34145455210.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6132568815ad3.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/momotosikebifer.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/datuwopewazonovi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fcdac3d46---75639317146.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/6403c8e2ff828c6f670d064170c30fe8/18302917493.pdfIn PDF document text
    • http://devison-matras.com/upload/file/8925816150.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/87387926522.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/75252402120.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/bubezesanupetiwaleluw.pdfIn PDF document text
    • https://savitravel.ro/ckfinder/userfiles/files/pibinefafivanume.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137cfddc2bff---rusovipunozolozufor.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/72695479048.pdfIn PDF document text
    • http://czyxchem.com/upload/files/surapibo.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/84358726888.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/selokuwewaxiled.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9e0ca4614---4484650516.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/89281708643.pdfIn PDF document text
    • http://cbstav.cz/file/diwewuxatobavufabirukos.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/196582420861309f278a686.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_off0000d43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43F 20176 bytes
SHA-256: 79bdf42130bed5d7d47c634fe398fa42fe197800e9fd9251a00513d52d7edd4d
font_01_sfnt_off000109d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D1 10952 bytes
SHA-256: 0739ffd51ef159dd98ca1b633e52e2f0ebfa1732548c84f8ed11696b71a58306
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1