Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d63a4d45bcdec6e…

MALICIOUS

PDF

72.0 KB Created: 2021-07-04 20:55:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b66b52888d00e26b0d39481b19b6dbec SHA-1: 5c11f9fc3eba67d191bf5128178ea98354bcda9b SHA-256: 8d63a4d45bcdec6ef18695bd8c9f7a251f62dbea55ab5576bfd02755c733c3b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous external URIs, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of embedded URLs indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://queure.ru/uplcv?utm_term=tally+chart+worksheets+pdf PDF link annotation
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2026caaf7c---17215342819.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/7d6b7ac7f41c4919bd0463012b81f302/21576905319.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/nusukawikajisuku.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16085663007899---xinunirex.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/61b8c82deb2d3bb85b25750d6901a661/49439871145.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/todozeripoterufapiwus.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/39101027827.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bn7v5l9ocuj947naa7gvlopme4/87933821858.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/xopagukatigef.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd46a073f3---29875092460.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/af7d177b1e4e286cb08c2c1cb6517b60/kowoviwuremizokov.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aba9e8614f7---88317004265.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/jejojamovomavajafi.pdfIn PDF document text
    • https://coevent.ru/upload/files/8151669797.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/tekawedava.pdfIn PDF document text
    • http://htwy.com/upload/file/gugasut.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/38836867090.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16079bd39b659c---ravonimisini.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/67111201112.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/feda725cf32683a0866d4c4deb4535a8/71055554012.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/529a7e5c72b1bad6a7591f4540e009fe/fesebe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c0ca7fa265e6a69cc19459643060c238/3193669749.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/ludikimobixixanoxus.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_off0000b835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04C 10776 bytes
SHA-256: c09a0652408f55ac9faf9db08bcfe0d81b7248573722b233a3c1de3b292ff895
font_02_sfnt_off0000e96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96E 15676 bytes
SHA-256: dcd216637a5880b5b1c35dbb2c4435061b9cd5203563aebb85e246a4b0f7d2b9

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