Malicious PDF — malware analysis report

Static analysis result for SHA-256 6664dbda8bd2d067…

MALICIOUS

PDF

77.0 KB Created: 2021-09-04 05:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dbc800cb8ae359119dcc8fcaad46073f SHA-1: b89d86cda604065dccbcbd6b2cb0a46fe923238e SHA-256: 6664dbda8bd2d0672789ad5a5521ce8765ce887138e0b1ad9b4078ef2c843ec6
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URI heuristics and link farm indicators supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/onu3ncilinita09jms5e43d721/fozojixovavumigis.pdf In PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/c2b46989c93449580b8435aa96437395/13786520862.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf540af844---56204143740.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434e36dcd8---41929649570.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/waxedifekigotida.pdfIn PDF document text
    • https://havadisname.com/upload/ckfinder/files/wexobonurovil.pdfIn PDF document text
    • http://cga82.com/admin/File/zoxowedaguwufoberazi.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/pexid.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c1cabd043---83842259623.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/64833683976.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/4060997489.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/zobugivajivedorajivunobe.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/35345606561.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/dukavarujufijux.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/79805944961.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/rupaxevaxakalul.pdfIn PDF document text
    • http://canadanur.com/resimler/files/33860355352.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/45944449774.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/logujejegajeseke.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/61533190117.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/susuvamax.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/zopolevexotafep.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/83088362976.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ganesha+chaturthi+story+in+kannada+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB989 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa
font_01_sfnt_off0000c29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29D 18424 bytes
SHA-256: 5eee30fa11702770432a1cc98fae32b53542667d525a2a6628d4b9ebc4cefa11
font_02_sfnt_off0000f1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000109ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CA 11016 bytes
SHA-256: e078f397c69107e49aa6e92bc863e45985927ae8a84ced638011b76e02beceb7

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