Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38ef6fbf0415556…

MALICIOUS

PDF

80.1 KB Created: 2021-08-31 19:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 715b7d204b022ccbf793ea471ff93e00 SHA-1: fd0387fd043dbf5dba9f0aabd6c547c78a360362 SHA-256: b38ef6fbf0415556871c7012d54a5d4026e1dbd62c85976b3605a4713d0b5dda
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document exhibits malicious characteristics, including multiple links to potentially compromised websites and a high ML classifier score. The critical finding is the 'Clipboard command execution lure' heuristic, indicating the document instructs users to copy and paste commands into a shell, a common technique for executing secondary payloads. The presence of numerous external URLs suggests a phishing or credential harvesting attempt, or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://cructi.ru/uplcv?utm_term=win+10+boot+usb+download PDF link annotation
    • http://parentini.it/userfiles/files/48524764018.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/41721129794.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c11d257f8---25995025663.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/ffa4cb16d0777a3d95dc0d89a2b03c9a/lusonepijusitikudan.pdfIn PDF document text
    • https://fallsplat.se/file/wazunadixofareditozel.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/6571002047.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/61625121026.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/9738701758.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5056aa4c23---84507049180.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16129e15f0d849---19526398580.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/18966928479.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/zatebepolukubekadu.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/23142875506.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/dogorilatarupunibed.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/tupekafix.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac74cd92934---bogododovekixesatasoga.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/naduzubekagilaw.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb2efc5179---22368729593.pdfIn PDF document text
    • http://cwesp.biz/upload/file/48130409508.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/lb6jatt9n3jnnsoqgskp0fjt3p/pepaxavopunixijewixuma.pdfIn PDF document text
    • https://netlandschool.cl/files/lamakivaxujoxerolovale.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_off0000d446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD446 10504 bytes
SHA-256: 8e0904dc6de5a1be5c596c26993806b673a4ab7248f081174bc88e68fc5a6936
font_01_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 18008 bytes
SHA-256: b4c48582bfd80ab737b65f0de9eb593a57208a78ab339102e4dcf8fd0fab15dc

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