Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a0466f7e86c8aa1…

MALICIOUS

PDF

78.3 KB Created: 2021-09-18 03:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ad94f945b6e3fccae302ea71a9585223 SHA-1: 4497c594d8efa96e9ed7e447d2e8bdb9dd339241 SHA-256: 7a0466f7e86c8aa1f6464ea76560eb674a5f669783f86be4bdafc2d50fbd586e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting. The embedded JavaScript, combined with the link farm, suggests an attempt to redirect users to phishing sites or download further malicious content. The document body was unreadable, but the presence of JavaScript and external links strongly indicates a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 http://moscowprice.com/content/xuploadimages/file/79087397309.pdf In PDF document text
    • http://dekogard.net/deko/veri/_files/jafawiv.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/nulajufe.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/76779081628.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/84030736840.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/vipuwiloxiguj.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/xorejezixokudusomatilizij.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/fogugutasizigakoxalux.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/kimumasob.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210908083704.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d77a5dc2e3---suzajezuxudewejareme.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614526436ea45---26387185107.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/tisokegivulepifezux.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/gusosa.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/89916643516.pdfIn PDF document text
    • http://pp-aqua.com/userfiles/files/838168378.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/bafigej.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/pazizulete.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/mivafisanupozosexebo.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3f4a9552379f97c25d2648801b088f4c/bometofapaxaj.pdfIn PDF document text
    • https://fetogram.com/images/upload/files/67190134383.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/62131275173.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/63756607773.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/6801669660.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=should+you+workout+before+eating+breakfastPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE599 11240 bytes
SHA-256: b5717af14221ed1c56983403a0e8c7cfb626396b871c66520204c847012ddd48
font_02_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 16768 bytes
SHA-256: 2f9487a9f69d7d9f794a03f9d10a588db780bd0820f5a6f301ca274cc3b953d1

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