Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d026d8d85532cc…

MALICIOUS

PDF

91.8 KB Created: 2021-08-16 12:28:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: aac99faa62622c7fff2c3554656313da SHA-1: 3533a4bb732c511949e32e8ec8620f363ad8dc78 SHA-256: 63d026d8d85532cc5f0dcd7564bffe0bee8f5640fc528990261ee679bd0b2a1d
284 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document exhibits multiple high-risk heuristics, including instructions to disable security software and to copy/paste commands into a shell. It also contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution lure. The presence of these elements strongly indicates an attempt to bypass security measures and execute a secondary payload, likely downloaded from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 10

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://synerhu.ru/uplcv?utm_term=kmspico+v9.2.2+%3D+activator+for+windows+10.8.1-7+%2B+office PDF link annotation
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/8g4jk8hln3elvatp7jk9kr6kf2/korofifanedajan.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/kekoraneko.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/58882872ce563f7216681bf21a01365b/55232238288.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/80d1500e3eaba0e45bb6ee15fb494637/85193517681.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/56082687921.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wenam.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/24037983037.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/fonipuketiwiroboxika.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/a330bebeae7c294d7b6f2c1ad5142e0f/10826095578.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607928a74cd80---kidizubopaxopasot.pdfIn PDF document text
    • http://carszana.com/image/upload/File/6387489734.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607907d20a5f0---lumowala.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/bce1bfa7a4a8178591a76f4ed7559e84/92365263607.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/tutazovasifoxuzawinuwepi.pdfIn PDF document text
    • https://marosme.ro/hirek/file/dubegesebilomiw.pdfIn PDF document text
    • http://signauction.net/userfiles/file/sedubonudi.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/fcpbumba3keg7vglok2du46q53/dikipowizebegupejitimixas.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/42e986154fefa914f0d6bcbd75aaf8d6/33503086504.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e250fa02db---40045262796.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/10175229228.pdfIn PDF document text
    • http://meadclassof1991.com/clients/c/cc/cc689d7a74a098ef67b43942063c7ff9/File/pitolezusaxim.pdfIn PDF document text
    • https://pasarantogelsatu.com/contents//files/73328502819.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/86475780004.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_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 11744 bytes
SHA-256: 5d442d340c0cc573add1259789aadecf91c695a5ae283a76ddf9984a40023c9f
font_01_sfnt_off00011a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322F 17568 bytes
SHA-256: 5cf6c4590a8aedc78c44a1c30c42a00127106562616e69bb89173697c490c995

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