Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3c5c517a1e988da…

MALICIOUS

PDF

77.2 KB Created: 2021-09-25 23:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e551f076365e0956ddb4ec364442dfd7 SHA-1: d6c0a59090f28ac316ac2de20c4075b34d5cdf9d SHA-256: f3c5c517a1e988da0bcb9f796c788209257477cc1fb9e929fe1e95a1b1369348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF, as confirmed by ClamAV and ML detection. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of external URI heuristics indicate it's likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=cara+menghubungkan+stik+ps3+ke+android+tanpa+root PDF link annotation
    • https://ev-owners.jp/userfiles/files/gomulilixexoboge.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/worixifepo.pdfIn PDF document text
    • http://riph.pl/userfiles/file/tavenidud.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/zefowereloda.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/musaxisegeluxatefulofa.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/31214354098.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zakajenoli.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/202195147288337.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/putuvazevufofuwori.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8aaaa5a96---mojisulolojeful.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb2445f69a---30462336906.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/pedalaxamaradari.pdfIn PDF document text
    • http://gad-elhak.com/userfiles/file/34706980593.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-06/628a92e006e45a8506764cb69a38a662.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/85571812972.pdfIn PDF document text
    • http://tid.vn/upload/files/niguwajodirufawunu.pdfIn PDF document text
    • https://duongthuy.net/userfiles/file/93659547015.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/0a585d0ad00fa98c2df486c0ab005fcd/21473958271.pdfIn PDF document text
    • http://ozkayalartrans.com/userfiles/file/71901865562.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/72249557745.pdfIn PDF document text
    • http://bwc.lt/i/jumuvunap.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/zokedolupaxopufip.pdfIn PDF document text
    • http://jucal.es/images/file/mubupikewuli.pdfIn PDF document text
    • https://lapdonline.org/file/81300541162.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_off0000c229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC229 19380 bytes
SHA-256: 527a9ac4e81ac51d93a4793c356ca3a1bd4e11cb73e8cad00c782ebd6e10d35a
font_01_sfnt_off0000f4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC9 11328 bytes
SHA-256: f4f4efe12c0608769950e5a36c85087d29942a9e3429b0b76dd24855f06e9231