Malicious PDF — malware analysis report

Static analysis result for SHA-256 50cf997df3fec7cc…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 22:32:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 46ab958d8760bee60e04407d282fbd43 SHA-1: 50c0013c7d6b11e7f376935a7a74ad6fbc63d3fb SHA-256: 50cf997df3fec7cc8f33d6264380d0e4b3f7dacc7a3b82bb2bdefaa314e06386
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://alarcon-v.com/editor_upload_image/file/zaloregoponogepadumomozuk.pdf In PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b33c03f2a13---lopalobotor.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/37191858288.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/53367952140.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/f473e1d65f1682d4c7e7ed1bab9aa01a/62614185962.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/musazozibokujupodokasid.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/v4nlg9sclh42uqik6i8iju0ul4/39037625552.pdfIn PDF document text
    • http://nc-israel.ru/upload/files/89429195739.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/3f8fcd2e43b77f0cc3a12c462283d39f/23911114496.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff66f8f2859---vimowonowatinafojef.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210829_27C5ECB692BC46E1.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/rebobasivetijenezipute.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210901_171016.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b7ffdec52518f4183f72d331f1d2c7f2/61251436849.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/judezobamufipove.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/6857015003.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/kixefo.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/bekupurem.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/86474544476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pasteurella+multocida+in+sheep+pdfPDF 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_off0000b8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F6 10984 bytes
SHA-256: 504457a850036d5b9a28261881315f3cee21f6565bdc9aa8efb1b9a4f1cca364
font_02_sfnt_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 17372 bytes
SHA-256: b2f834252470fdbd46af6ccaa55f61e0bd8ee4ecf39e33109646cd63369f1925

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