Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5726b3a1a754ec…

MALICIOUS

PDF

83.1 KB Created: 2021-09-17 17:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 108f1489a62cbb4fac8feca8a9f1914b SHA-1: fc252404a8f9eb710558de4126a739739ecd3275 SHA-256: db5726b3a1a754ec8525b0330cd5a405e69aba5e2d115edd8c1cd1048676fe1f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1140 Deobfuscate/Decode Files or Information T1071.001 Web Protocols

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. It contains a high number of external links, many hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. Notably, the document includes an instruction to disable security software, a critical indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://nomylo.ru/uplcv?utm_term=human+fall+flat+download+app PDF link annotation
    • http://csc0351.com/userfiles/file/20210904054729_0zyuta.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/safunivipofuwuf.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/manefemokesanifodez.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/50644975340.pdfIn PDF document text
    • http://sk4education.com/ckfinder/userfiles/files/nujoxovezupux.pdfIn PDF document text
    • http://usateatop.com/_upload/files/lexagofuposobeworobaluzew.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/kufiwaxovagemobesuv.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/34312928470.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/33823551512.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/88724998322.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/202192124824032.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/81004380754.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161374976233c0---zurozagugarofamibosegetuk.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210912065018.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • https://samajsutra.com/userfiles/files/14303460232.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/52daa6423410b216049710ff6db16994/vikafakosagenororowelav.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b9585fcd---wavudazovol.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/mizesodufisemikowawa.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/63074404962.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/49997484937.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/22784034535.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/04126eaa8728c7e8e07b1860676b7a3e/94597530539.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/kusotulupilotuvo.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf849e7f71---19436330494.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_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 10344 bytes
SHA-256: 87c27ab846d1670f3149b7d27d375cce531145a1b86a5c98411e612fae3c09bd
font_01_sfnt_off0000fa21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 17184 bytes
SHA-256: f757a84fc0da77a18b76850ce9d80558d51de876396880e3f6c0713e24e200d6

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