Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc55b0199e0662d0…

MALICIOUS

PDF

84.5 KB Created: 2021-09-09 19:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f3d85b012a007678016577f6a9b387c SHA-1: 1e4bb397cdde985c1943726cd7b81c5980575d02 SHA-256: bc55b0199e0662d0f7be9a032d3358f73b1feeb9c6bc4f33c54551a1ff97db94
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and contains numerous links to potentially compromised websites, suggesting it's part of a link farm designed for SEO poisoning or phishing. The 'Remote Support Lure' heuristic indicates the document's content likely instructs the user to install or connect to a remote support tool, a common tactic for gaining unauthorized access. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/70996457394.pdf In PDF document text
    • https://gmnavarra.es/ckeditor/files/73891085848.pdfIn PDF document text
    • http://jiehuist.com/userfiles/files/xipafepaw.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/sudezafexagiwusur.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/t8k9ihh2ec47u6oslsa6rqffv0/45889422973.pdfIn PDF document text
    • https://ms01bet.com/contents/files/zetuguvutesulovaz.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/zikogexiredavebaw.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303d8d40d2e---sosupudosoliwumixulusebof.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/kuvex.pdfIn PDF document text
    • http://ikcem.org/userfiles/file///90492476783.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/narorunonemajusuze.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec99333681---2871933268.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161377f844f8f5---56813457882.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/fegumoweto.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/15573812553.pdfIn PDF document text
    • http://northcity.rs/slike/files/42201517706.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/27535630419.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/16838904132.pdfIn PDF document text
    • http://gyogytornasziget.hu/uploads/files/julezukaze.pdfIn PDF document text
    • https://rosycaffe.com/file/65270565172.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/mekibolomejawogelovazobuw.pdfIn PDF document text
    • http://prompol.com/media/file/19559061748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=tv+remote+widget+androidPDF 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_off0000e577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD89 18036 bytes
SHA-256: dc3be3dda0a3535cfe281a133ecfc87a939eaf4ac97c5290d755c0128f52c6d6
font_02_sfnt_off00012cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB3 10492 bytes
SHA-256: a7f86728e7667c826d2c3f145493c2b0f7209193dd8a0076124d9c5ac4652621

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