Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa0a142154b4007…

MALICIOUS

PDF

88.2 KB Created: 2021-09-02 04:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e1ddd0e0fdc50830913806e3a596d0e SHA-1: d43c84c23c506c580b594f1f8ebe44ecdd62c5a0 SHA-256: 0aa0a142154b400744c119c9da1762961868fc21fa301baaa0f1f3206e1ea442
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents a visual download button, suggesting it's designed to trick users into downloading a secondary payload. The numerous external links point to compromised CMS uploads, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=physical+education+class+10+cbse+notes PDF link annotation
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e0970723539c1720ab0d26fc9e489003/bodiwuletibuwobevam.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7d036e0904325e60469063d68c5314e0/jesezepufowukozojalek.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/vnjc3nmhqd8d3jfqh9ja9ufrh1/dutupolopisuzokitozeme.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210504060534518253775.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7ed2f16ccd84420f78117f306f647e00/36936406446.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/97258381258.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/38202569360.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6aca5a27a7---22298474331.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/tasoturuzanelof.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/83272698342.pdfIn PDF document text
    • http://teplospectr.ru/images/files/vakufejadi.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/39300759442.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611ee32ce675d---6467314178.pdfIn PDF document text
    • https://x-software.cz/data/file/57847714634.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/75234847446.pdfIn PDF document text
    • http://labsshop.com/d/files/golakaliwofidatumesotax.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/95062040220.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0622136d4d792f172aaa5eb2a378488e/41782351221.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/46343321754.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/talakiras.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/70331334615.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/bazegabawet.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_off0000f3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A5 10896 bytes
SHA-256: 7d079017c6be30f188cbdd4d1e160d7de822ff757ab18a053437301c4f421a32
font_01_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 17916 bytes
SHA-256: d1b541aab233a9ae531a48eca2cda2d6d9be09aac3e93ac73a93840fb0a2bda4
font_02_sfnt_off00013b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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