Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b37b514a9248e8f…

MALICIOUS

PDF

87.0 KB Created: 2021-09-19 09:35:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 031e80ae2a5c2999f318d8d1db82c54b SHA-1: 342b3b32b0f464bd6fc42d3e61d66e2ead30e17f SHA-256: 9b37b514a9248e8fc43061c87c15fe80132ecfc75041aff458452933bab8862a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The numerous embedded URLs, many pointing to disposable hosting or compromised CMS uploads, suggest a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://magicdiscoradio.com/userfiles/file/poxununa.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/g08r2ftjukfphgvu2lhfs59rs1/83022059898.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/taremosatuzerobar.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/17184647100.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tozewadusos.pdfIn PDF document text
    • https://keyseries.us/userfiles/file/bunozenipugaga.pdfIn PDF document text
    • https://cvconstructionsgoa.com/pharma/admin/userfiles/file/28977342824.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/48916152281.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/rixuti.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/fowexazovukulo.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad0b6aeee77e54de80f9affd1e44e2cf/22317490223.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/biname.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1614179fec0c45---32221664818.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/52246043797.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/lukolinagazudeviserad.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/mobemapusoxekefogo.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136f91976d12---38170611325.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/fabokuzizupafimopiji.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/sazivoxa.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/814900312.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/97404281421.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/tojikosebub.pdfIn PDF document text
    • https://zagi.hr/files/lukewulivopobujaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=lock+screen+ads+remove+androidPDF 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_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 18988 bytes
SHA-256: 616429d8ae3e871d1dfd81949386b185bc0c67e1439ab3d6981cd462bb38906c
font_01_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 10500 bytes
SHA-256: f68ac5c905f52c8db9108c84a497c5383dcc92b4a83ec791e844d08d7fdba8fe
font_02_sfnt_off0001361d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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