Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcea6bde123b0ecf…

MALICIOUS

PDF

77.1 KB Created: 2021-09-06 20:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42408bd00e80128de4b78cfb1bf7d59e SHA-1: 022cc16edfda4080c551cb2531b927dcc455f4dd SHA-256: dcea6bde123b0ecf86621e622a9c42678c867dfb4d5f1ea06cd860521131152f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The embedded URLs are likely used to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://coretry.ru/uplcv?utm_term=uhlig%27s+corrosion+handbook+pdf PDF link annotation
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/fec24f894850bb419d09e5b7e02d9652/67048214953.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/a344a57054d2abe771defcdc241a189d/62320693248.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ca60f6de---49438045545.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/buxevobodi.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5be2bea23---varemivulujevofufeded.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202108311146376492.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/xizeziluwubaxil.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/61173428067.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/18666581087.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/damukujidu.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/91403006338.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0jhqhtvc65os9bh3h9gb5d74n7/resadagupun.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f50186b84---20428657405.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/9523812144.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/18993923164.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/95062874642.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d033e7e721---13716459639.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/dokilur.pdfIn PDF document text
    • http://ledson.ru/upload_picture/31532881266.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073771b566bb---38290123358.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/85361082590.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1459047b3---rokap.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_off0000c604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC604 10940 bytes
SHA-256: ebf69ab1551bb8f4805b0dc887ccf4efaf82abc6210c35060f0ec673e3be69db
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 18236 bytes
SHA-256: 56047b7ab7e911d5193ba9fa2ae7dc2f5179362bb66a3a24edbf6df447bd5588
font_02_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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