Malicious PDF — malware analysis report

Static analysis result for SHA-256 4476cfaa11041dcd…

MALICIOUS

PDF

76.6 KB Created: 2021-10-09 00:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 753b45700681d3c227834e5040eae7a4 SHA-1: 76dfa3d619cafb66b8cc7899ecc13baacb675dac SHA-256: 4476cfaa11041dcd5dc6ba6b3d0394445fc8ba9b64322afffe12d29d7743d7e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on disposable domains or compromised CMS uploads. These links form a link farm, a common technique for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=land+and+property+act+1925 PDF link annotation
    • http://phubozena.pl/userfiles/file/kilitebama.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/94777327991.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/2530151938.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/ruwugopivoloremejef.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091513422884.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e363e7f4fec7cf5a3c1f6323ecdf1b73/jopopixini.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338bbf7eb46---39874976617.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/rakekelejinenosugeru.pdfIn PDF document text
    • http://8njl.com/userfiles/files/13066952395.pdfIn PDF document text
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/zerufimexijenigizotora.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/vilopogoz.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16158e7c8bbd5d---46287672286.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/janopuj.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/xoxinosudef.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/87018791868.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf5c118372---miwisezujisu.pdfIn PDF document text
    • http://handmade.sdelaemlegko.ru/files/userfiles/files/dasuperimonutuvonoxa.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/kapiredoriwovozudajadel.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613170e7b1089---zemiv.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/89956221233.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/pexixemitovulasopojasid.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/53349838130.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/87934985426.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_off0000cad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2ED 10744 bytes
SHA-256: 4e538e94b8cb7857b7b7f37c78fd9f40b8b830218b0cda1df2e7c8dfd46d41d5
font_02_sfnt_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 16188 bytes
SHA-256: 7f4335bd1ed7d247fce20e5ffc84ff902b634f3902c274331762aa1c20829a2e

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