Malicious PDF — malware analysis report

Static analysis result for SHA-256 9135956aa0274706…

MALICIOUS

PDF

77.2 KB Created: 2021-09-05 09:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a56c82bf039db286340af402a9152d08 SHA-1: baf97af1b9a9aa99156ab98194564d26550d1f0d SHA-256: 9135956aa02747062474c00fbdd15ce88a25daadd720edc029d63f2042c276a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/c0878c91f912552d2959438574957032/59008283413.pdf In PDF document text
    • http://studiopedrazzini.eu/userfiles/files/lawajefilonenaneja.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d112b36a---kopezexefopeduzerij.pdfIn PDF document text
    • http://blueyee.com/upload/file/251438236685.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/56303736374.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160af31116c016---12967307299.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/10812651897.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/vezoju.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/98798593349.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/6061d575774d007ec5566ffd4dc9c7fa/11721311139.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/xozejiton.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082964b4dd8e---92868464151.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babeaf8c8a0---24642294358.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/39628024656.pdfIn PDF document text
    • http://dzbnf.com/upload/file///47680453192.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/xikopikegelev.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160804f557d943---fazus.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/65818435112.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/6319551125.pdfIn PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/10448629623.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2f79535387d9554c14cac52bdc2d2c63/42356561288.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/21276579675.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/visoxapafadakirokizaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=super+30+entrance+test+sample+paper+pdf+downloadPDF 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_off0000c62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62B 11244 bytes
SHA-256: e20be9607e09082d2b80f5104c23c48ac320ce5980d7cfb58adab6900847af56
font_01_sfnt_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 17904 bytes
SHA-256: 82582d9420fb3c71a7d2f131cb7a323e6e72620cf5c54f4249a6964c4de80c79
font_02_sfnt_off00010ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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