Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae59eab07429b90…

MALICIOUS

PDF

99.2 KB Created: 2021-09-25 01:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a8b0ba80e4d14d5d1c7bd112db552d68 SHA-1: 371459dae6993fe44d4a93e97dbdb839aeeaf792 SHA-256: 4ae59eab07429b90262ecccc1e4fbe2cf7a2d8261b6a2c992a7b04cb5b83396c
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm suggests it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 https://garglob.ru/uplcv?utm_term=aut%C3%B3s+j%C3%A1t%C3%A9kok+let%C3%B6lt%C3%A9se+androidra PDF link annotation
    • https://soi.icami.mx/ckfinder/userfiles/files/vobox.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021971750118531.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/0b5632962b7e48723839ccda4431870e/pawolakalurubuzela.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161324172d23b9---14426934089.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/livufirimemulepu.pdfIn PDF document text
    • http://esejsc.com/upload/files/77576947735.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/4cfa6d28b5548c70b30db011ae54c67f/kisoluve.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/ef43f7803969f16f56be000940ea4fbe/wibokataji.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6jd4ia73teer97snhvrkt1d0q5/71380975310.pdfIn PDF document text
    • http://realestatespoznan.com/uploads/gosegapeguxinolojilunuw.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/fokukagekexulusakefimo.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/lesivuritulewimasulalubez.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/79071798782.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/narotuwegabifowo.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/nuvedajufabag.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613721150ff69---97377455403.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3bdb049be---6584824794.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/kuxofanumaneluvaw.pdfIn PDF document text
    • https://aneri12.cz/res/file/zulupidevunuraxaf.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/xuwile.pdfIn PDF document text
    • https://taperagi.com/contents/files/sikefukefuf.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/20502562927.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161410e6e8ffcd---87510508156.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/kopokojivanerisopojemel.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/puganumibonamanoko.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/nodaxaxuguxebubu.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/71762420668.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_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13283 11232 bytes
SHA-256: 95e0ce3181d57e993e2f68176ba5c974624848c2ce97ed61043f1b0062ede527
font_02_sfnt_off00014b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B8C 19992 bytes
SHA-256: 62e511615e556aa45833ad64dca4f96a4000491fd534e1a7ba8d663395d36ca5

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