Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b149faaf1a9990…

MALICIOUS

PDF

96.1 KB Created: 2021-09-15 21:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed80256915ec6127545948fe25dbe93b SHA-1: 2ec7838542ab32614e9185b222f021e936f3c7ca SHA-256: f3b149faaf1a99902829dd9a79d56269076886bc4436117a64f9795ea1025738
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=gta+5+rp+cheat+engine PDF link annotation
    • http://kientrucsangtrong.com/plus/files/ruwamukalesozepivozepuda.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/39401089216.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/kejitusitesarive.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/51137180631.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/11053376442.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/52962625162.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/vidazijewujami.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/33189989669.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/nidoxipunen.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/45931529145.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/n5csne86q54gg03r0hncrthgc1/dejatilesotatemukunu.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/68754557230.pdfIn PDF document text
    • http://01host.ru/userfiles/files/4410511775.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/02d146c788ee2ff1bad39dc5f6d4bc0f/nanuwurevexudulaf.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/mororadigomirevafasom.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/bubalupugaxukuledutaxusu.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/65373393566.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/10143689087.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/27209149861.pdfIn PDF document text
    • http://ymmicro.com/files/files/63376834572.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/62894222499.pdfIn PDF document text
    • http://chinalabware.ru/d/files/pewisowazodasomufata.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/nagudetevi.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/9539a33b5439a178feffd317d968ab6a/46338870632.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/9586044838.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_off000111a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A5 10492 bytes
SHA-256: fec17411d9396f807da885e6a430e4a3a03826442f8844e3cc6ffb3263ab4617
font_01_sfnt_off00012983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12983 18572 bytes
SHA-256: bcb5bba187205df3b38626d159e589b53e31cb0f06340b669f1767f1e0d1b6a1
font_02_sfnt_off00015a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1