Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfee909e332a8d0f…

MALICIOUS

PDF

74.5 KB Created: 2021-09-04 23:48:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 050d4bd04b94aed184931f16a09b4b19 SHA-1: 33e8a00e7c75568b52d5b3643e82bd9dda1995d9 SHA-256: dfee909e332a8d0f576073529a8499b75b7c825865505f50ee0f86aae136c067
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=manual+thermostat+honeywell+th5110d1022 PDF link annotation
    • http://didaconcept.com/admin/fckeditor/file/zekunila.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/fetasema.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/828a895310695a0a7922ec8a514a366b/11901897046.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/hg1gr65galgl0veuc6cg55gqok/pakilusonerelitalazatobad.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b7b6676dbaa87d507f4c8f9e3420e148/17204749990.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/en7ibipaslrv6n5j6ovpqisr94/xiworodikuganelotebo.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/xemexafemosigadexugibukex.pdfIn PDF document text
    • https://sce.tw/uploads/files/60c3a4c2c6cae.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/e333966a93486a4a60ce53e732711921/pesemifemukifemanad.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f5d6bdfa---xojonenaledatafo.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/mogadunosobogirazifubo.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/21985894987.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/519spreobd7q478k0mvl26jjf4/nivufezawupegepewodif.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/86953642978.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721455a7900---lurisirivaxuzuzimimesedu.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/97163636425.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb581d84cc9---mofik.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/5c6538209cab0e33f016ced8c363fcfb/nizozosufomu.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/24570930703.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfa5e7b367---9690021299.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/bezedobilapu.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/6595e618f87bfbc031b76519b34a9b91/62309617648.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ecfaa3596---30118418171.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_off0000bd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2B 16528 bytes
SHA-256: f23ed07c792eb683004d033661762fb30413fdacb5539b017bf43eab1c48f916
font_01_sfnt_off0000e800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE800 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 11140 bytes
SHA-256: 389ecbcb7495a07a05cb35f88fa4bf35dd5e1e9cc1901fea3f890babbdefb203

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