Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c6ade6bf673561a…

MALICIOUS

PDF

72.5 KB Created: 2021-09-24 19:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f77675f026940a8939423f69f944932 SHA-1: df9368104b9467b6b3ba550e9dceb7bf4b897825 SHA-256: 4c6ade6bf673561a69c4a0266c70fb4d7ead827c0874bd51b7891019a57443d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be part of a link farm designed to redirect users. The presence of 'utm_term' parameters suggests tracking or phishing campaigns. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=rapid+streamz+apk+download PDF link annotation
    • https://mamap.in/ci/userfiles/files/geweriditofet.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/nanopuvu.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/8781220657.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/12533810422.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///37749340016.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366a937777d---22862807997.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/62118064574.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/93515399835.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/57403103232.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/pevagugekopepumamobasuxux.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/63353884566.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/zusomurode.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/tubasavuxen.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16137a93fed92d---85829944418.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/19069668554.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f342a443c7---tubiwetovitev.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6c1437ead---bopita.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/tutuselurofimenuvebej.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/9752935369.pdfIn PDF document text
    • http://podushka.by/files/files/52864046929.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/39184620891.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/jo1hv3qnt4m9j3r5gst8rra0l6/93354736275.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/kezevaz.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/nogadubiduzigevinuniva.pdfIn PDF document text
    • https://trystsalonri.com/images/file/xugap.pdfIn PDF document text
    • http://ahknchem.com/upload/files/jefetinunimugexutorov.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16149d3f932efd---42957686294.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_off0000b6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E2 10836 bytes
SHA-256: b02f3be80014b99e1e4c1e4141ff3938cc7ad6c7a27ff2239d3656be53765aa3
font_01_sfnt_off0000cff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF9 16692 bytes
SHA-256: d37b76540b019f1b8dc13baf153bcb41993cfea541bbfbb4551d3f8431e99560
font_02_sfnt_off0000fafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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