Malicious PDF — malware analysis report

Static analysis result for SHA-256 4baf116d1c25a7ce…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 09:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ee78e5ce19c49276d3b648a8cfeaf6a SHA-1: 3abd2cb7043250da36a9302118d9db8b8f08b04c SHA-256: 4baf116d1c25a7ce24fd320aaa6c1a825d674461fe2c575883f3f8ed406b8b18
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95', and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users through potentially compromised links within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sysyanginguvenlik.com/uploads/files/22511557655.pdf In PDF document text
    • http://zaun-produzent.de/userfiles/file/11078385300.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/sovegilizase.pdfIn PDF document text
    • http://panova-art.com/files/file/23912093940.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/xijopifu.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/5655510282.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef3cb83da8---61804527512.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138f810da701---15328950911.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/pudizo.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/25846286108.pdfIn PDF document text
    • https://2winit.com/Files/files/gebogukes.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/wijepekixanuvatejopadonuv.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/72935780050.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/82369483771.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/niviputowebuxo.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/97299807323.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/88819502081.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cef4a3270e---xijuxu.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/vezalojugowume.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/wowuwumamefixif.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/96581536016.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306023d5573---48268071143.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/6p367glrkct7f0k9jb0j6gt6s1/tamodalawidusok.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/tojuderubexudelugedi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hell%27s+kitchen+match+and+designPDF 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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 18544 bytes
SHA-256: d2d4ffcd88365262a7eaa839b180f2d3b43ac9a4930380239fd0358eef1846b6
font_02_sfnt_off00012609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12609 10712 bytes
SHA-256: 280ec15c6516617aa5677bb266cc113f65da2964e454eadc343a0beda4701d88