Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f4dffaf04994796…

MALICIOUS

PDF

84.0 KB Created: 2021-09-01 11:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: ebe210e95b58b90d5b775df4cca87e34 SHA-1: 0f03e4df90ca65ffdd7d32aa6bf8c78b24aeb58e SHA-256: 0f4dffaf04994796c69a73908cd2ff128cc7a0fdd1947ab7e573becc2768491f
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 0.9977

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 http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce1848a018---53957275487.pdf In PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21e5a4c14---lalokaloworutofesagamuz.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/2a032bb566f9222647bc302810acb552/muzagakasaseretamitojok.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c2c7f8bbb518fd03846abfdf0d4fd703/fotitolisoma.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/domuzusavasa.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/18818976221.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/3386744799.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nimaxolilidebalebufoxa.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16074a65c71dcc---59907335918.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ffa53079085---tuvirujapamugomum.pdfIn PDF document text
    • https://bloomeng.com/uploads/mepotokuz.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/pikebudugawev.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/mafaxepubesavarivizum.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/23273294086.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099284473c3b---dafifal.pdfIn PDF document text
    • https://tepihtrava.rs//files/fenofedarasi.pdfIn PDF document text
    • http://suseefinance.com/userfiles/file/vaxitimiwugumor.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/8a0f399027d15c26b942c9fd35cd4072/karipolavumajosisepelom.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/jaruwamoxula.pdfIn PDF document text
    • http://starsunited.at/upload/files/duzurerupunegoxekipuso.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/1412520713611d855d21c7b.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9dab0d08b---bajukezuziwovapubaman.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c59fa5cc05a---devopa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pokemon+ash+gray+game+download+for+androidPDF 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_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 10996 bytes
SHA-256: 73d10bfcfb77af700d6b1b5189ee59ba4fee1f469cf6409ee4b07fd8a260e732
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 17948 bytes
SHA-256: b2a2105780552ad0c0253cfda61dc6db35b5c6c67cde255191b7c2c05d180dfc
font_02_sfnt_off000129e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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