Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f3a1b119c9bbe9…

MALICIOUS

PDF

72.0 KB Created: 2021-09-19 09:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f6d32ac87084b54c6055d88f18322b2 SHA-1: 78fcba2700650b27e4269be7293409bc5feb4728 SHA-256: 56f3a1b119c9bbe9facc60fbaa3ab28fa0e9212bfc8ef624eb14926adf7408cc
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • 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 https://coretry.ru/uplcv?utm_term=pokemon+ultra+sun+decrypted+rom PDF link annotation
    • http://tjsyjdq.com/v15/Upload/file/2021951356303490.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/bamavoxa.pdfIn PDF document text
    • https://alutat.com/data/file/dedabu.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/a03938blvgtl1d42iols1klte1/31764947024.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/202197127368730.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210908145717_OTcxMzE4NDk5Nzc=.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613819fd79ee9---39839715800.pdfIn PDF document text
    • http://wish-pharma.com/upload/files/dibofaxidulinurulozokomom.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/36779197001.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109150820061833.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/kevewavimikotegebiweto.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090621504952.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/famuzilobujaz.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/3546acbb465560b84e381817596eef28/wirekusojemomufixotag.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/27801506327.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/6fb3b0062658f61b36120b26dc80ae67/losuwomiji.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e25ca79f40---28201050495.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/87448492210.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/kozezirulilijakivukose.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/xijozudatajukuso.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/7123270966.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/busefaweg.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_off0000b5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A3 17260 bytes
SHA-256: 5b5414105018bc2563c3fafc7777ef1de944713a5746e87f054a297a4e1fa0f9
font_01_sfnt_off0000e142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 10892 bytes
SHA-256: e9ad43fc7cec655f3821a98b29a508607ecf57d99b176ba53d48a879cee8e7e0

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