Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c9a22df1f89bae1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-16 19:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a6c1c56fb98b8b99f1a9c39a32f6b29b SHA-1: 520684c9a0186551e2e935ec2c55af6c8cde675d SHA-256: 6c9a22df1f89bae1f1e2efcafec4a2001b6ec437cbf12c60dfc6df7ff8c85225
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards techniques used for distributing malicious content or redirecting users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://sbsoftware.ro/admin/userfiles/file/gesufedi.pdf In PDF document text
    • http://www.s4b.nl/upload/files/6584777265.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/74827612306.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/24874536362.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/2550ff7cbe4d9739aad22aa12ff8225d/41443245339.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/zitelovinixutidulotames.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/fotixulukeguvaperesato.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb3d3e3bf---79883104010.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/xawomitimaxubedesewelipup.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/47181007070.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/lukununa.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/bigewarer.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/27521392628.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/xojipawu.pdfIn PDF document text
    • http://esejsc.com/upload/files/71210004670.pdfIn PDF document text
    • https://unosms.us/userfiles/file/55651520803.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210911112328.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/71520764931.pdfIn PDF document text
    • http://gtshotel.it/images/file/nifiridibujexenedakud.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/21200213002.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/jawutasiriponasipubedo.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/dasijejevuw.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/94169643971.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/mojomize.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/73093471747.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/oqi50mv3tv0n8ktqdoobf6dotp/76055105246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+automate+android+appsPDF 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_off0000d635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD635 10684 bytes
SHA-256: 4bc014f6ebca2e89d05a3ee36853b124fab7bcc69f7becfd88e9f205259670fa
font_01_sfnt_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 17368 bytes
SHA-256: 3f61b7140538aaa7bba21a5c8b0bd04c47d95f014d62fa147b2a47033fa2fd3d
font_02_sfnt_off00011b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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