Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd78c2257e28cab0…

MALICIOUS

PDF

81.7 KB Created: 2021-10-09 08:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d8c69119d0e92c37ec054cba0dfeaf9 SHA-1: 9829679b49fdc3de87dca9607b5a5690af4c7e0a SHA-256: dd78c2257e28cab0babb6df96c50ef8af87536c9500a1ad058cd2df5f64a598f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external URIs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics suggest the document's primary purpose is to facilitate phishing or malware distribution by directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://allytemp.ru/uplcv?utm_term=dynamism+meaning+in+english PDF link annotation
    • https://gujaratisamajparis.org/upload/files/65057656793.pdfIn PDF document text
    • https://fasleh.net/Files/files/4402563551.pdfIn PDF document text
    • https://vleek.com/uploads/files/24994326466.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/sejawidawujolapavimub.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/91765353278.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/jefibari.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/70255742441.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/d76be4cccfbf460404e2cc27c1370aa9/motidudozutem.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/93309581803.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20211001_F70C98A8EF4C0652.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158005924e3c---sidifafasavilidimewepurub.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/89165073756.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615376462c17d---visubomobutenagifovufan.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/99049921319.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16156d80597a37---63219147776.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/bexufoguxiloweroben.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/demuwifemadujirud.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/sixetuwutabufotab.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zusoziwidukaz.pdfIn PDF document text
    • https://mytopics.it/uploads/file/70341209062.pdfIn PDF document text
    • http://straps.by/ckfinder/userfiles/files/15538630833.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/73285546763.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/paradebavobekakufa.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_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 10352 bytes
SHA-256: 1dc1d417c716c3e0c7d16981e504123f5d8318374b8739c89194cb5808319a03
font_01_sfnt_off0000ea17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA17 21048 bytes
SHA-256: 69b95a84a4815df6891e2b1c28b4d942b934e45e189550e2bf9abfdd02aa90cb
font_02_sfnt_off0001217f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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