Malicious PDF — malware analysis report

Static analysis result for SHA-256 256af25dfd276524…

MALICIOUS

PDF

76.3 KB Created: 2021-10-09 15:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a8a6b9fc6c4aed98edb53618640840c3 SHA-1: 429ae7d1a11912330fe16d50a4ccbb2f65b2f742 SHA-256: 256af25dfd276524233ad45bf6533438e3aca82fae2b4332ffba3133abebc4f4
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing and malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://leeandrewdavison.com/download/zisoxakujo.pdf In PDF document text
    • https://yourwebcenter.com/files/file/legunedikenuririzexupej.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/77809922588.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161599803b8533---48417581609.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/nutugewewojaganukivekene.pdfIn PDF document text
    • https://g-mtcc.com/motakamel/Ups/files/55696654770.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/gatijijezijodobalow.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337d1a6a14---nipuvuzobujinir.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/dadaxogodimumibas.pdfIn PDF document text
    • http://pakianco.ir/data/image/uploads/news/files/48099933851.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/mikudekuten.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/gitoziti.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/99590949601.pdfIn PDF document text
    • https://highrise.pl/file/21323083336.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210908_220137.pdfIn PDF document text
    • http://etnorom.hu/pictures/julukavifakonobij.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c9a867a5a---wudokalolegu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615631963f27d---dukeginunijadamoxu.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160dec22cd0c---81115821721.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86a872db3---24078593709.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/xidisagipun.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210908140117.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/39295258080.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/gemiwuwewosotad.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/kosupanisakirapuridapapi.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/86047364371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=it+is+the+gift+of+godPDF 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_off0000c7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EB 17568 bytes
SHA-256: 64b71076b41de9de0c09d4c2f53cfc93863ba6bb69d571319bc5e2f7394c7e13
font_01_sfnt_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 10172 bytes
SHA-256: 894602b698f28c59c3283333cb4e4e74cc1236edd9cad094d960531d1d59371f
font_02_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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