Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f3895274fce92a…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 20:07:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fde424c8c4fe6d840d4428a1d8c01f1 SHA-1: c62dda59ce707e1bf0c1bb580e640cb4077697e5 SHA-256: 83f3895274fce92a1668234fe214a6e15d5dec733096a3b9087f62043cb3ec14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous URLs, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0i1ne1fkeqeanrhiko092t8dog/tanokipilenugijokovijega.pdf In PDF document text
    • http://yuhongzg.com/d/files/jodezosezapofib.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/76759734258.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f434bc24b0---kituranizafud.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/mewaxoraxopu.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/xumojevanoxoratoxelunabe.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/87778710545.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/b7fd868ab8db587e08d958651a5c7baf/94377070121.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/javop.pdfIn PDF document text
    • https://gencatakan.com/upload/file/soludozazalufipowulabub.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927c7a05446---pesor.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/daganet.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210901094454.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8vgbbtek6nompgns3ldhu4i2cu/pijibewusovow.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/70153430336.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2dc4b3f1e---6730213973.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/56873341485.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/24837664209.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/453022610.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/o0h1j8dkuhfm1sh4a20v7hs6i1/ninofavijelimumipibubez.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/ximefaxefonulevir.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/sodeledoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=add+a+column+to+postgres+tablePDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98C 17404 bytes
SHA-256: 126c9c0e07a067592e24aa95dfcf862607df2884102fbd6f35d83d9bc444c01f
font_01_sfnt_off0001071b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 10988 bytes
SHA-256: 0b53f98384b9453ffec258558e1ac7d0bfae7949035dec237b361c174224c5e2
font_02_sfnt_off00012038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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