Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39b20a23bbc37f8…

MALICIOUS

PDF

86.6 KB Created: 2021-06-26 16:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 8b6950ad2d178b0c7b6419171221d3ac SHA-1: d5714126687d31c08a13f632130e75f761fcd6c7 SHA-256: b39b20a23bbc37f824f48f76596a86d8a2a12559cddda237446d74f52603a3f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://catamma.ru/uplcv?utm_term=my+3+year+old+wets+the+bed+every+night PDF link annotation
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/71bl2fbro9sksajpkupgj85774/walagibugitoxax.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/rizotibegirepodepel.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/e5sej9d87sl98q3090lbhpuqru/70396939437.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/12hg4s42bojph8412hn042ugi2/80529138933.pdfIn PDF document text
    • http://allasclub.com/campannas/file/pemenefisuvilumaxe.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c5f82432b87c1b254bd6e8886e6147b4/97676133214.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/54494856385.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1cd0679e8---bajum.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/aa00c97d0ddb8210388ddc226248c064/kuraxuvimitar.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5650b2608---3567476817.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/16003c93ddde63b1d7065b76b25cefc3/52652027807.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b0b27ad2---pigalokex.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/76fac53a475e487b49d9a4df7847166a/83979100369.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/l6jgcrruis9ib842a7rdd8pgqm/22781282051.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc46e66f71---pilowuk.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/paxogo.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16075c0aee4e48---tigizar.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c76209e55---82773571717.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607024781dffd---12353763936.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/pejurotigefenubujuku.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/23647039471.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec417be481---62639520408.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f62796446---poresuzemekit.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_off0000ee9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9C 11100 bytes
SHA-256: a56b44695b60f9fb4d02e7246152373d78d95ee0f9c3525f15d3c46814c8d200
font_01_sfnt_off0001084e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084E 16508 bytes
SHA-256: 9c61ab298ace21d739f789420aa27d9cefecc43196f75a027e7befe7dc75f4c2
font_02_sfnt_off0001332a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1332A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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