Malicious PDF — malware analysis report

Static analysis result for SHA-256 8069b41a04aeb54f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-04 06:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6ce85667a4a36d25ce1355b6470b8ef3 SHA-1: 196e278abfd8e8fed5d165b596c2910fe8d6ab14 SHA-256: 8069b41a04aeb54fcff19c57d601425fe03871323166c3f3b07464b496ca1fd6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. ClamAV detection and ML classification strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=mitutoyo+qm+height+gauge+manual PDF link annotation
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795a0d1ccca---riwozizinivubajevem.pdfIn PDF document text
    • http://yilip.net/userData/board/file/dizugitiwawewiw.pdfIn PDF document text
    • http://stromzeleny.cz/file/31306846252.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/3938709422.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/funekubona.pdfIn PDF document text
    • https://medtek.vn/storage/file/gipulixunegopugeker.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/xesalenulovojibozefedez.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/mopajebeverawoxo.pdfIn PDF document text
    • http://hasyo.net/files/file/veruzamuwaroruximopurubas.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/fakolagewifabomifotuvow.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/zirebaradasa.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/3ccdca626ca6a02795fbb35b8902d732/mikid.pdfIn PDF document text
    • https://ubranni.com/uploader/files/riwerupep.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469f9d0825---vozuvotevilok.pdfIn PDF document text
    • http://freetds.net/userfiles/file/33941042456.pdfIn PDF document text
    • http://simonide.org/userfiles/file/4812733715.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20215231749328115.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/zefizajisetonepek.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/bidede.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/63013915455.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/paxaxax.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_off0000c882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC882 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE099 16628 bytes
SHA-256: 4763f043769df6be595b79d308ef542aefc5d5c99564e15dc27be24ea673bfa0
font_02_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 18800 bytes
SHA-256: 510580c1f3fef7d99a265604671b7fa34329b15071ef0e106b20108a3d4f9536