Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5152f27f37fed69…

MALICIOUS

PDF

69.2 KB Created: 2021-10-01 01:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 08153fc5c9a7bf277577adb57642e047 SHA-1: 745915818f9b0c36d7808c3481ccb74ec04b0d23 SHA-256: c5152f27f37fed699e73a6d480d76873597fb5d51503ef6baf918fa23d5889b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wanyuantemple.tw/userfiles/file/63246870980.pdf In PDF document text
    • http://zatuchlina.cz/upload/file/1674693302.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/bumamijodud.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/71409166477.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tipikatotibevib.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/jizofudokamalenikufazapab.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/022f3a378dc70b731aefe1ff8328275e/58594285771.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/maxafogijuwekivoj.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e1669284a0---zuwuwune.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/vurudulematagimejux.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/bojexibidurojirexasujat.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/gexomejugogudubebenoxo.pdfIn PDF document text
    • http://skolky.info/foto/images/file/84388871777.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/25966682072.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/60973142023.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16139656607939---54318214463.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/lezulawaguji.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/zagakejuso.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/vesatevoka.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/bajufakirajezil.pdfIn PDF document text
    • http://195exim.com/datas/files/xabagopawizametoge.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/dasigopapitugetoniwar.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee4114a52---vokotuzewakanezuvumosum.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161415574e471f---8759801405.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vanugofexoresutivojiret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=callu+call+recorderPDF 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_off0000b47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB47C 14544 bytes
SHA-256: 8d5ffba9c64b79c2c707dc7dc88862d6e0f3efdbab7d6d3ba9ef3428dbc3a3f5
font_01_sfnt_off0000d8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8ED 10032 bytes
SHA-256: edc0603382738e1009f320e610cf914e11a68d290dbeb04dcbe69c0aaa27e46a
font_02_sfnt_off0000ef54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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