Malicious PDF — malware analysis report

Static analysis result for SHA-256 de3468ac6762b8c6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-08 06:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1ec2c3492110aa32d1a31c38794941e5 SHA-1: 4f281d0b96f4b534e5289e9b0ea35f47ef0bafbe SHA-256: de3468ac6762b8c616039833b001f2f717a7cec24ac24205b2d14426497f4864
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://marljivo.hr/userfiles/file/bafoxiseda.pdf In PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0076c8409---40173502722.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/zunosetosu.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/zopemesalet.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/89806464764.pdfIn PDF document text
    • http://slsnn.ru/content/file/volilubuzubo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4c4412f83c22874c24e8705c17b098ab/65487391863.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/wimefufexukeruxenutipunez.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/2bbf8b096365e38835463559ebe5b691/buzujiteze.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e34bdcca4db---tefovobodonaz.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/zurujo.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210710063023_554522542.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b25c297ae0---zexute.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/31694877248.pdfIn PDF document text
    • http://firegallery.ru/img/upload/55795713126.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160763c898d2e6---mivulusoletonegezoravase.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/f5e403d71b8fab95117443f254107776/lukekanor.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/tukafetopenisigo.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/38315900428.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/68527867790.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ad14eb272a5b419e0e48bc8091aa9a13/89488216055.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161180ee308490---nuwesenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=epcos+pf+controller+br6000+manualPDF link annotation
    • https://rt9.rspo.org/ckfinder/userfiles/files/xeperobizuselubafirera.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FA 11060 bytes
SHA-256: 121eee4bd756117a1a89c0a8444da6a25336b5cb42a17b238b9f26cb2d00ae5c
font_02_sfnt_off0000ea8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8B 16248 bytes
SHA-256: be4b568a546a80f466c9cdb8a71893d2552b90c0e707c0adc20b4a45de5ee6cb

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