Malicious PDF — malware analysis report

Static analysis result for SHA-256 af54917db05bbc3d…

MALICIOUS

PDF

70.8 KB Created: 2021-09-27 17:53:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a7042a76c7d7730ded5998f2bcb4f415 SHA-1: 11346b8c906781f927496c79f27ede1894454357 SHA-256: af54917db05bbc3d3d232d3250eed2fa1d0f8432b954a16d79fa13ab983c921e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple external URLs, indicating an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript (T1059.007) is a key indicator of malicious functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://inwebjor.ru/uplcv?utm_term=snapseed+app+pc PDF link annotation
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ade81178389309cb01a5045ef0e46b97/zeroximivugudob.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/83330822928.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/afeae69b93dcebc73de3e9933377b615/41477405817.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/lidilipi.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3597be01a3e53d8de0e718f5755c58fe/33825733776.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161344991635c9---mebodegofanoritof.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/xaxuwut.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/37094127753.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/3094161339.pdfIn PDF document text
    • https://ratosatu.com/contents/files/makexofajavigigatupo.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148cd3b545cb---17324901161.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/4408645974.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/nigok.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/falexivexifojuf.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/29491620899.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/piwunekutetal.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/49920691242.pdfIn PDF document text
    • http://ave-france.com/pics/files/gadapozamezoxopo.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/xovemikonevofozu.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/xejuxadogunigosuzefotu.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/94645214886.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911050733.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/fobufavumat.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_off0000b335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB335 10128 bytes
SHA-256: 54ad49945eb483f93559cc2659b2f38743509ed3e459da0d5031483233fbc57e
font_01_sfnt_off0000c9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E2 17184 bytes
SHA-256: 3e3ac4c97391bff297502899fecf8d28b321bc78c60bda8cdc5b3d7c6d51e169
font_02_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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