Malicious PDF — malware analysis report

Static analysis result for SHA-256 549bf313886b3b77…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 09:44:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d92b21ce9cd8c7881a97dead7b7d88d SHA-1: e4ddf3f30afda0a6f624222ecd948f38919e6565 SHA-256: 549bf313886b3b77349a14ba85e2830c8da201aa6b6300809a2ca10b5aa036b5
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. Heuristics indicate this is a link farm, likely intended to manipulate search engine results or host phishing content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://infrive.ru/uplcv?utm_term=race+car+vehicle+dynamics+milliken+pdf+free PDF link annotation
    • http://konikanarrowfab.com/ckfinder/userfiles/files/kupugozibisazuvugepigaze.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/mujuvawesazi.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/37221075093.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/86908498902.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/runokegibukotugade.pdfIn PDF document text
    • https://sergiomauri.com/images/file/18719156730.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/48061083550.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/gufafepojopunevevivakib.pdfIn PDF document text
    • http://st03.it/userfiles/files/rugobepapikopesewedezoniz.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/4e809d6590708494c324059d17809023/67046603449.pdfIn PDF document text
    • https://empresa-venta.hr/files/kosafiruxukajaka.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210906111017.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/buribelozajupafa.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210914061524.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859df06067---pawoxoxifoda.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/58583554088.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/lanijofowibofolalesazo.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/nopegodawenojake.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142b4fa0041d---tikegelisexuradalaxador.pdfIn PDF document text
    • http://parilka.by/var/upload/file/58305861322.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0292cbc54---21812478889.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210909060958.pdfIn PDF document text
    • https://pierreseche.fr/userfiles/file/kerolumoguvelofasisivuxi.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_off0000d81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81C 16856 bytes
SHA-256: 79ce066acf23b68ae157266f5a00cad6a17764db31f22097d745d7dd2b4b5059
font_01_sfnt_off000103b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B1 10984 bytes
SHA-256: bd1594a975b48f0a34fb9f680de4c962d00c113be8205527410bee3c0db4231f
font_02_sfnt_off00011cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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