Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd87b815b7a569f…

MALICIOUS

PDF

92.2 KB Created: 2021-07-03 02:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2784fd8cfd8a3b6dc98d7c4d90672892 SHA-1: 7b46106c5169b02f2fb04af28445d5bdbec43c3d SHA-256: 6bd87b815b7a569f16bacd90af4bb240c8ad04ffe1ce0d58605d15e03fadb7ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bataretak.com/img/files/file/kutanilavulexefovovot.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/nul80g9l7df9tm85dliado8js2/12380524332.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ffc88b50b---gakevorigipifojapusu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c9435d262---welujo.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/wikunosasaweropoful.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/13588608610.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d655565e8a2---xawomulinuwiro.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/pewojekeli.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/78687aab5301c9fcc44878238c84074c/16089980006.pdfIn PDF document text
    • http://pestcontroluttara.com/ck/upload/files/jojafirexerumo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/d0ee6784c65f0f5be14e48b8a2361015/ziwuburoxexegezore.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/23465785238.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/1o3m1h04i3i3clrqi5e84rdjt7/69740884287.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/filafajidojazuxipibekaw.pdfIn PDF document text
    • https://htddienstverlening.nl/userfiles/file/67200918672.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d384c6f7a3---laguxokeg.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d8edeec61---23200684763.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/58a0d1e17ffec7e109d1e58bd5e906b3/6190718976.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca52658a0dd---segusiwadakimunobisepataj.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/7669845490.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/86998197405.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/1b71af9f79acf4d8f7381f97595aa4f6/25020654991.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/puwibedofijubewoturom.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3fafc643d---37896737471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=kate+dicamillo+flora+and+ulysses+moviePDF 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_off00010070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10070 10908 bytes
SHA-256: 3419d10c549492b56031f891456be06ef43954bc33c1f8a529cd8ec6a4ae5fa9
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 18320 bytes
SHA-256: cc24f10babc3c725c528e22b1b62dc82792c76ee3629b408d2b41db2bdef16c3
font_02_sfnt_off00014998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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