Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad3ca5632c5db52…

MALICIOUS

PDF

105.0 KB Created: 2021-07-08 07:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 45fcaf88877348a7a94a1c882127db2a SHA-1: 36950bb6b4ed8b6b36268bf1b5ed66d68bd8a153 SHA-256: 6ad3ca5632c5db526b06fda2ddcb858cc7fdd6e79be722a1f05050174f8462e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious File

The PDF was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host or facilitate access to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792df211892---54099375874.pdf In PDF document text
    • http://bomtvplus.com/data/board/file/20210511223952.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/afbf2d3867185dac8fc32fed46f2b47f/mipevekawisowubovokap.pdfIn PDF document text
    • http://teresachild.com/upload/files/warifanilizuri.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/to0gcudhbk6b7eilqfnplakvrl/kafufuk.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/fiwenutusobefubevubar.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5fe67cfab---purivedasolurijozadi.pdfIn PDF document text
    • http://berbun.com/user_img/file/82238582512.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbde3a5db83---zokufufelasivikum.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/f018a54a0dca83b64bf5e29df7a9572d/kupaketifeza.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7553ebddb---23952524910.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f7d91b93c---geduxokefepovej.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/ronovujisewimamolosufur.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/51881903242.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbfea9e9e---50174251850.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/0da452ad94f0157d669fd3de6ac4dcf9/javakadelitetotowid.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/jisokigasega.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/8ooojul0j1fihv5m19dk9oq2l4/36503338960.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/21227538763.pdfIn PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/nasesef.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/74533768624.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/68555911541.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/97968331366.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c6ecdf45c87---2894723986.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160badc8cb6e78---visediwimon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=benign+prostatic+hyperplasia+in+young+malesPDF 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_off00013917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13917 16704 bytes
SHA-256: d776f6158ff5f211d8e83dffc848c7230a17370e9c28e1e43c6d9696c6ab3a1a
font_01_sfnt_off00016492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16492 11088 bytes
SHA-256: e0abdea0d4dc16ff3f8491893df0a55ea8f1d44a0bb299d764127ed4fd4164a6
font_02_sfnt_off00017e4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1