Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b08559128d0a5b…

MALICIOUS

PDF

96.0 KB Created: 2021-07-16 09:11:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ab7e2078868fbde0e05bebbc9c1a8def SHA-1: e10c36685f51f86dfc253f4e2de86ac8d9779ce4 SHA-256: 81b08559128d0a5b97ea6866b71cfe2c57465f40c5d049d0096039209ed4ba38
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support 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 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4aed51ce5---rikopalinijawo.pdf In PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6834b7685f---43476127561.pdfIn PDF document text
    • http://zionhillfirstbaptistchurch.com/clients/73368/File/11375643179.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/fifajopoderejavufamu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/8ad1e032a2581c6597c5e2c03b9d2671/luzabulaxagev.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/52802628763.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57958e553e---13152788490.pdfIn PDF document text
    • http://healingtown.org/userData/board/file/92036293330.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7d2717b0---wovojobupej.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/banama.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/l52b0qcp7ip9aout7mh18vtdqb/jobozibuwaronobuxagevuki.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/30280267767.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4ce918dc---fagukiduvaxi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kjb47t8fdejgr75t8satfca8i2/80065144733.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210704195754_549604127.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8646aff7d---30289582550.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/vegem.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/98633769896.pdfIn PDF document text
    • https://eternalbliss.net/file/gexumuvuzomaxozasijidoza.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/14723956246097b8024c2e4.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608842ed6b7ca---98029165794.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+you+reheat+chinese+takeaway+ricePDF 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_off000113a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A4 17832 bytes
SHA-256: efaa167bc4afcd8ef70ee8e8e8d136500b73d0a6702ba0f946a61a0030e6dcee
font_01_sfnt_off00014202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14202 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A19 10704 bytes
SHA-256: ae9772baf1d0d1c8bb6102e2f96b639f08fff1964b25e48096b1d0c6cf4c9804

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