Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6062b95ca0cbce…

MALICIOUS

PDF

110.0 KB Created: 2021-06-13 21:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c6b38e1fd2e776abb667ace13b827b6b SHA-1: 4691a605ee456d13ac7c1628d7f8f6f779ae961d SHA-256: 6b6062b95ca0cbce6b915ad93a038add7652e666914fe8414c1e10ecc27ed989
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' confirms links to compromised WordPress uploads. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://inwebjor.ru/uplcv?utm_term=stat+stick+for+khora PDF link annotation
    • https://watertorens.nl/userfiles/file/timubomonuzomixuruf.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/ier4almpkcnlq50siqd77i00t3/nejubegoxabebazowetaj.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/90394761548.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec5f76e7ba---54947899380.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/kezeroba.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdf777e63c---95141076832.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dfdbc17e5---wizolopatoto.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87630dd1f5---radisetajogarozaku.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/76duntljfkcohl8ir8t1jk3ns7/mozisobekadatizer.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8253db580f---duvazupimudef.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc53a1c9e---pasiguminofeti.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zetodiregi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090801998469---21990077859.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/3h6lmnmc4l8vfa15rhqueipct7/bozili.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49a21e923---42430156344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 4668 bytes
SHA-256: bdf9eb08996461990ff29e3e183d740b64a050c4cbf9449993521c7ba3ee016a
font_01_sfnt_off0001501d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1501D 2424 bytes
SHA-256: da50bc3de0be4bc7f5df1b7cfa1a65826e2158ca7168ae5f95adf7db07f7245e
font_02_sfnt_off00015af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF6 12420 bytes
SHA-256: 712941362f44d4aee1be3db88beb68c95c0c1b002fd1b52dcc70f30be9c0eec1
font_03_sfnt_off00018537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18537 16340 bytes
SHA-256: e9cccc4b71bb0b147f36789b141865a68c98028408c1e6c9e36cdfa6406a1a4c
font_04_sfnt_off00019afa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AFA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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