Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ef9541d7d81332…

MALICIOUS

PDF

99.3 KB Created: 2021-09-09 07:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 046ef4c03947f7010d7dda6bea69ebae SHA-1: 245fe2d0567ba0e559f4917f208ccacef878a799 SHA-256: 28ef9541d7d81332fb94cee4e3f49ce8a5a24e2bf0d640a1a61d1d47c50b8de2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a significant number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with phishing or malware distribution.

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://archism.ru/uplcv?utm_term=how+to+make+android+emulator PDF link annotation
    • https://pergamine.com/ckfinder/userfiles/files/zudilokozavekojufogiruge.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/94267827772.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3e6b9c4b---11125219419.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/47470451226.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/93316357040.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/60516853003.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/41235249302.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331737c5036---35856685946.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/gexalitamamokurofoku.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbfd974bb---loxalanadivolar.pdfIn PDF document text
    • http://szwygs.com/upload/bosorezumirifarog.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/milajipodefevumupoditil.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/pikupatapabaferen.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/d396655e61773125a1ce7702a4127383/nepad.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/17409902139.pdfIn PDF document text
    • https://heyratacademy.ir/file/73023145206.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d78ae66fe---jutuxamenub.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/rojexajizujojubagafura.pdfIn PDF document text
    • http://easy-sleep24.de/shop/images/editorfiles/file/wulenufubovimasonom.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/gonofiduti.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109061501466692.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1630780615.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/xezobebadorizer.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_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 18236 bytes
SHA-256: f0c7145108e1670066e02c68ca649a8ea9b2a754962df4313d8fa6387f262db2
font_01_sfnt_off00014f72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F72 10512 bytes
SHA-256: 8cc051a11ae07fc5edd94209d2fa1d507e628c437ff2e57d415f9e3fb7192227
font_02_sfnt_off0001674b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1674B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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