Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0b19d2ada4d09e…

MALICIOUS

PDF

71.0 KB Created: 2021-09-13 06:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0703842f34c51e784570d5d70ce12c67 SHA-1: 353e308979d4c9b2dc17b84176dcb4b8bfaa04d1 SHA-256: dc0b19d2ada4d09e0e6183af09607b6b120444e0dcebd9d16fd9ddc105df0491
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=jio+caller+tune+mod+apk PDF link annotation
    • https://shibbirs.com/media/files/63889454505.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/vakupisujubavud.pdfIn PDF document text
    • https://mackbeks.com/files/file/85080562515.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210913_9AF491040F5776A9.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/71734016954.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/9594087047.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/17137379492.pdfIn PDF document text
    • http://africalegal.nl/userfiles/file/19728391644.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/tisinukexugesetikamon.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/a992fb3cfc00de531f3ecb3b505409c5/tivamovumevare.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902085603.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/ropajekumoxu.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/lexilapi.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/31395064972.pdfIn PDF document text
    • http://glassick.com/userfiles/file/litixuzidegijexuxumadadi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134519e7d7a9---bikabisupovixijuv.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613278b61788c---jegitakawajafijawikibin.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/1808024167.pdfIn PDF document text
    • http://schokofontaenen.de/idata/84237153597.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/31017509201.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/60962373237.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/20941044751.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fupagozevof.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_off0000b5c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C3 10688 bytes
SHA-256: 148488ebec2b653cbcba51e60aff1605bfb805c20b747591b1fe4ce253e1e23a
font_01_sfnt_off0000ce43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 15772 bytes
SHA-256: f682f3c9066cb079cb09074b6b92b2cea79e8adde2e324a5e87d9412a6db878e