Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5442f04b9ea943…

MALICIOUS

PDF

72.7 KB Created: 2021-09-03 05:33:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 03e70cb4ba4dfe5dc7e8c977456d3f8c SHA-1: f637275e9679f0c36992f55b0ba3d60b948f8cab SHA-256: da5442f04b9ea943b5ffaee676cf453b0be10fde1aa5f0e781d2f36cb4515ca8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=cessna+310r+parts+manual PDF link annotation
    • http://massarentearchitettura.com/userfiles/files/sutenixapopuwojuvisi.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/99530012662.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16128d72a8e768---41821026819.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/tonudukiwojewisiweto.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e15fd85a85c73a8ad380698b022ca626/54455360657.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/bfd244b4fbdb6e104b5d4dfd01896857/96134445496.pdfIn PDF document text
    • http://riccaassociati.eu/userfiles/files/8591012668.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210605004749.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/12324358442.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/28rd140gt7i8s0t9qk83jd1s06/67657993582.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/58077718993.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162529430743.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/mibowevogamemuxin.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/midijararekeforofexopuve.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/11260543200.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/edd97a18ba2c0ed297966370271aacee/24397432937.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad34de55370---xazenoteko.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a508187854---xurukidivedupalaga.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/86796452467.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/narofeboluxunujiguditalag.pdfIn PDF document text
    • http://bereanbaptistashton.com/clients/1/1c/1ca8668e480cca1e897b6add33210fc6/File/79018560781.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0aa13293d---82354107924.pdfIn PDF document text
    • http://jp-cable.com/d/files/27010499619.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_off0000ba56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 16308 bytes
SHA-256: 6a8ebab416f0006fd70a93daf8f9de2658858a1e4e8609168b97ba1543b68aec
font_02_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10680 bytes
SHA-256: df3776835e6187a87c0aac3fad7f042f333dda41a5bdb633731581d10d3b8647

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