Malicious PDF — malware analysis report

Static analysis result for SHA-256 366686c2c7e4f22f…

MALICIOUS

PDF

94.4 KB Created: 2021-08-19 03:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 389edef357ad72621fd3f9d431216eb3 SHA-1: f1a0bd5893e134369798094dc02601abf940c24d SHA-256: 366686c2c7e4f22fc1ee9a1d3c4c74b2ee0ce83bf587bf03cd8a891ece42cbb0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF's primary purpose is to act as a link farm, likely for SEO manipulation or to redirect users to malicious content. No scripts were extracted, but the presence of multiple external URIs indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://nomylo.ru/uplcv?utm_term=egypt+pestel+analysis+2020+pdf PDF link annotation
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/la85ujmlir0f2jloud4easr13a/xebuvalat.pdfIn PDF document text
    • http://biosite.ru/images/news/file/8540340136.pdfIn PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/sowifabenebukoxiroju.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075b89589751---64236731035.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f65ac6d423f4efd49eefe2118f83f135/dajexilokebojidenetu.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e78a28207c---dadug.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zutoka.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210701165103_p5jk3k.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/fd2e4bc8a48e4b86eb697076961a9a74/38072880287.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/25700487716.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2df01be6b---20249767262.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/79817356254.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/76219823208.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/nitep.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160814201d827a---gojuvimujitegetom.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/2f1d128eb4170ce5832ffd57ce8c864e/jaxapekusoxazufupotumumo.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/89552073447.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082713df32f6---lotijidakezufatakuwaruzu.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/tujisabimurufil.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/24191064504.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/98789487438.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160947833ee631---91503578081.pdfIn PDF document text
    • http://itssilvertime.com/clients/2/24/24efe347a73a8ce028152bf895bc11a7/File/mabegeba.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/39175577651.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/lagegutuwum.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/93376996991.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a4ce2558cc---38263569470.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_off00010a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A46 10792 bytes
SHA-256: d811162da72366ce52a1b08262dd8328a4eb844709ebe8fa1c8b9b671bb2cfbb
font_01_sfnt_off0001231c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231C 17368 bytes
SHA-256: 2f44a42ea7c2f689ca860596fe3fc844549515afcc7cebad5ecd18214deab39f
font_02_sfnt_off00015098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15098 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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