Malicious PDF — malware analysis report

Static analysis result for SHA-256 359a4f30ca954eaa…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 15:04:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 19e157e358a1663773e4be85cf533a93 SHA-1: 5584de4eb4d742295e6c6977033922bbb4e98dab SHA-256: 359a4f30ca954eaa561109feaf045c1975086b0dca70aac934463cbe0792b7d3
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, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the presence of a link farm on disposable hosting, and the 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates the use of compromised WordPress installations to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=or+android+studio PDF link annotation
    • https://www.shropshirefurniture.co.uk/admin/ckfinder/userfiles/files/bogoxukux.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/zovemegusomifedewi.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/1115388665.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/vibowujot.pdfIn PDF document text
    • https://turasmobilya.com/img/editor/image/file/sasuketabalifuxewuvusabe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131098e4d6e7---bamixipeninolira.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/218344414.pdfIn PDF document text
    • http://flomojapan.com/upload/files/5068779848.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210903213350.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/82573247061.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/ropudizigo.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139406932b5a---28220032392.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161324a8ad0225---biketatojetidubusenone.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/wiwojuvu.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ef4f4ebe8---pazokovej.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/desoketunepubodul.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/nubozerenifovowape.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161500d43ccb6c---52715319631.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1larl033julc58hbk5ka6erigp/69784882306.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/85406913811.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/jodudejoxofulomowotek.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/mexuvinosimaf.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/nk3eme70ahalop2q01mukdair3/gazegesuvoju.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/mexopojubagonogoranepovi.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/25903300390.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_off0000b507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB507 10188 bytes
SHA-256: 704031ac73030d5b7b96efb30eed337ae54792a3d84e95677c724872492d8982
font_01_sfnt_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 15664 bytes
SHA-256: d839f7da115c4bcaeb60067e80b0d2b3b375bff9d820199b6fdc1d2ea00363b3
font_02_sfnt_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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