Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c82f05c3196639d…

MALICIOUS

PDF

75.3 KB Created: 2021-09-20 12:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c4f28b386f429d9bbc68c15d9b34da3e SHA-1: e9f9feb39af77bc7164af5f1821b73d43195e7c8 SHA-256: 4c82f05c3196639dfa3a0b2e1b5661476cbcc0f817bdf9f68afd39cfa220c771
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 http://abwingsmd.com/uploads/files/tepapigasebajozov.pdf In PDF document text
    • http://a1-automotivegroup.com/upload/files/22878889297.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/78507019745.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/20513310127.pdfIn PDF document text
    • http://epplast.com/files/file/26970889134.pdfIn PDF document text
    • http://peak-experience-europe.com/images/blog/file/39305862020.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613dacb68fb8b---bidapemokapunax.pdfIn PDF document text
    • http://symbolfoods.com/files/file///zomeligeridotig.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///kubuvofekubi.pdfIn PDF document text
    • http://le383.com/uploads/files/pufufewudim.pdfIn PDF document text
    • http://usagimatur.com/files/others/rivodisixituzulof.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478bf7c47d8---pafikilezabofutinibupevu.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/gokefopuke.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/59448868178.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/66262387062.pdfIn PDF document text
    • http://synphabase.ch/upload/file/26967519168.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614060b7a82ee---nixidebisatisusiwuj.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6504cd4c6---4175841351.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/29127020141.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/87240695912.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32499504878.pdfIn PDF document text
    • http://kag.fr/userfiles/file/vavagewowirefuti.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/wisifigadaxunorokuxodazal.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/22045681330.pdfIn PDF document text
    • http://irths.com/upload_files/files/23037275343.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161456dfb08f87---5863858127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+5+mobile+real+gamePDF 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_off0000c31e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC31E 10492 bytes
SHA-256: 0d7fadf6a217ebc8d29ac5a235c14d3b4bbab812f0d4e611624ff44b1b7734c5
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 17080 bytes
SHA-256: 977d59e045165dc7fb82e0e4f6d9bcd8e13141c7a97f0c184729b86ae344eb05
font_02_sfnt_off000106f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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