Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f63f467724dcb9…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 00:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 371082e310d6c05fa6e4dcf0b5372366 SHA-1: 1d9cda2d6e91803341bd32ad077f3e97a95c0132 SHA-256: a7f63f467724dcb9efc575d2cb9c0adc4e00b0d953aba1bf2e9d9d39e793109e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tuzvedo.hu/elemek/file/50292451090.pdf In PDF document text
    • https://detectiveoffice.net/userfiles/file/jofuxivazeru.pdfIn PDF document text
    • https://avukatwebsitesi.cicasoft.com/upload/files/momumitijuwegotu.pdfIn PDF document text
    • https://wrd13.com/force/file/zixab.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/98679308836.pdfIn PDF document text
    • http://shesob.com/file/files/ninotujuf.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/567432a35c007d77a4ef7a36921e4b51/27221110525.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/89819811752.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/18666398066.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/17796384144.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caaabbac95---bipovigofokuzixogigokupo.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa081c2b4e---11159396192.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/kaloti.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/58296522273.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/rupinerisun.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/49952694562.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/cc61041351ae1574b6126b9cae71622f/71356239726.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/sifefenelenifelu.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/weroxumorozutumemojidobi.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/21611007709.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/161502c3fd166f---fiwosaguz.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/tivasikutamapimemuker.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9e76c8db9---xesanitot.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/19115927603.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+the+100+season+7+for+freePDF 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_off0000b0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 16336 bytes
SHA-256: 09eb981bd57af7327a65184a973201d5020004e3bd14141d45b5879532744463
font_01_sfnt_off0000da6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6E 10512 bytes
SHA-256: f87159f1a90d223a3984846a3a00fd0db65f9ff7c59e3cadb730239f1cdb9562
font_02_sfnt_off0000f278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1