Malicious PDF — malware analysis report

Static analysis result for SHA-256 62121e5cb5d1d6fa…

MALICIOUS

PDF

77.6 KB Created: 2021-09-04 14:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47e8c1e019a1de2bc2b8347d92a27ccf SHA-1: 4c8cbac6e09e94ab7172c3bcccaaf11454d55927 SHA-256: 62121e5cb5d1d6fa74618e0f460e73b06042b7ca8551393f4371dde108591223
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell T1218.011 Signed Binary Proxy Execution: Rundll32 T1027 Obfuscated Files or Information T1140 Deobfuscate/Decode Files or Information

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains heuristics indicating it's a link farm, potentially leading to compromised websites. Crucially, it includes instructions to disable security software and execute commands by copying/pasting into shells, a common lure for downloading and executing second-stage payloads. The document also mentions password-protected archives, suggesting a method to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://bangprice.combangprice.com/beta/cms_image/file/44512177721.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160715cf6e3483---35727095907.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942015157cc---basirugepugomax.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e0a2a9b99---75464889458.pdfIn PDF document text
    • http://mamam.by/upload/File/file/32738229295.pdfIn PDF document text
    • http://cjatkinson.com/userimages/kaxakapixitajizofexulitaw.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/2kfctal279cukplth2e9jsoalq/monetepijekuzi.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/86f5a826653ca704a21d49f7e3e48933/29014783455.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/vuvepodezajoxo.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/402118f90b8070d1f6e35d5668226003/guziluronamurutoxil.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/balobegikuxunilojubupiwa.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16126d0c72dc46---binunopobotulu.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/jubolagokirokaloj.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/8bd712f79afeabba17ec397e5843fc4a/kameke.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/lubupodos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+foxit+phantompdf+full+kuyhaaPDF 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_off0000ca64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA64 10856 bytes
SHA-256: 04d11a65dcf8a735c56359ca3938b634d0bcd77b3a1ffe9526c9feb3b16c5a4b
font_01_sfnt_off0000e34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34B 17844 bytes
SHA-256: 9cce37bc1a559cff91949ca38562cc68fba69bea63142d8e0c74e80aff63ab9a
font_02_sfnt_off000111a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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