Malicious PDF — malware analysis report

Static analysis result for SHA-256 990a5ec8dada5edd…

MALICIOUS

PDF

73.3 KB Created: 2021-09-02 21:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 490c46658d90a1ed04b00a90c240b3d3 SHA-1: 753bfdc436899eb63c5920de5a776b19a436ae98 SHA-256: 990a5ec8dada5edd8497abb0918a689703303686f0b473d6d9ceb14a93a0a9b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient to infer a malicious link-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://gd-weimi.com/upfolder/e/files/20210704214624.pdf In PDF document text
    • https://camphacement.vn/upload/files/18883604079.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/17937090916.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/suvomubivifeduwogebekodat.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0352d14q8oairal3np335ikpp7/rebawebubil.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/65808081091.pdfIn PDF document text
    • https://deepankarbasu.com/FCKeditor/file/47340009300.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/xubim.pdfIn PDF document text
    • https://mollis.rs//files/rupefipoxu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/44250801810.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/39549916412.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08bae03c83---fusitogisigologopasomu.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/rawopozabojafu.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/xugot.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/27274201322.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/6389cb189998e5176847e0a2dc2057ff/27343918636.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b59cce9b---menude.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3ee07cb84c47d1a546bb78991007fc98/niwowutis.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/7cd0f9940aada134554830f9a7eda1b1/zorapitejaxozolop.pdfIn PDF document text
    • http://absigorta.come/file/60706423489.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3c89cb4e8---nesusarepodedidojipafoxu.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/11663aef2f5885c2fdc01c24d2bc5a7f/vaxurerakelukopaxisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=fuji+xt2+manual+focus+peakingPDF 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_off0000b917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB917 17340 bytes
SHA-256: c78ddb8aad88a92c3755b9e69ae62c8e13742720fe2681328b7749f57fcc42bb
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 11244 bytes
SHA-256: d9493294aedd0e699c89d64c3765c7fb3f8a4965ef7f8cce83290639823b13d2
font_02_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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