Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d259a3cef8ebd2b…

MALICIOUS

PDF

77.0 KB Created: 2021-09-01 07:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 85d0520bcfe93eed754bd00345fd0814 SHA-1: ca27a24359612dbad5d209388e140ecebfacec40 SHA-256: 7d259a3cef8ebd2b337866b07241f653087d13cca9b7c6c7dd0a3df8f3495691
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://studiodugnani.it/userfiles/files/57824591206.pdf In PDF document text
    • http://cdhsalumni.com/clients/28864/File/gazotufujemavi.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845263ef815---60150869091.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/nomamidebasudelula.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/2baolaor7vat7u8220tm9920o6/zidemefarewojisubenubifiz.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/79271916107.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/rixelofukarojiwu.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/93202451832.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/401f23a53f1892e2ca0e4926f707d877/50080779068.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819bd67ae2a---84440851817.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/93889546765.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/afe4283ecbecab2f599a6246c1f045cd/detetigotixiselo.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/27029235574.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3884d8914---36370628138.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/rogokemili.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1629250628.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/fejovovisifesofowudagode.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/zapavanadog.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/doboxikofelutojef.pdfIn PDF document text
    • http://ashioke.com/images/library/File/sibusepeno.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/c79a21831f0901772470e9ce507efddc/20733016085.pdfIn PDF document text
    • http://northcity.rs/slike/files/96618248734.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/titeboxapomizasun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=kth+royal+institute+of+technologyPDF 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_off0000c7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F7 17340 bytes
SHA-256: d63ef755f036b942519cc1573c8cc769d43653f9ea720dbc1adcc3b6271742de
font_01_sfnt_off0000f514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF514 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2B 10820 bytes
SHA-256: 89669b2546a41c7fe5f2665c4cd11628b40ca787cb6f6254f72ca10c8b5bd663

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