Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db81366e51b136d…

MALICIOUS

PDF

86.0 KB Created: 2021-07-19 01:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb33084c9106dc564be33ad29c648a0c SHA-1: f31cd0aa0a9716a2dedb5e0f6ac87f36b57da3a4 SHA-256: 9db81366e51b136d441f8e35ed724fa896ea301371fb21c4e90ec224e9f1f3ce
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line context, a common technique for executing malicious payloads. Numerous URLs pointing to compromised CMS uploads and link farms were extracted, suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a847713837---supanobuxelavu.pdf In PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2568002760---feditazepafizuguf.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/202hmnu9d8olk2q61002jrk57b/34045104515.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nuputum.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/91579304562.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/b507d1372529c992b2be3ef0f3b22ee0/xesupisokofiju.pdfIn PDF document text
    • https://menu2uplus.com/images/file/99882875614.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c2e09c3a8---muveter.pdfIn PDF document text
    • http://araonline.hu/uploads/file/vuxukopafozed.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/kilofupogezokurajaro.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/f88a46b108c523888d26b9f6b7d87ee2/69538264946.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/66224762447.pdfIn PDF document text
    • http://capri.lt/userfiles/files/wivesilowagodanuzaxurugaf.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/wisedot.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e62e1b99169---nutabetudageve.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/wujezefijebamodarilipoxu.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/94655924254.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210707_A41FEE6F3773ABD3.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/lewidejoguzateb.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/f23e7d76202aecc50bc404bda46a1714/josojobelazosexif.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5773d59bc---38217069790.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/voferekiwava.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/cfe8e458d2ee23aa99ae549a18ef876b/bafej.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ubjjqrejdpoe01emp96u88nkbk/rakowepalovi.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/sawuve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kung+fu+for+kids+near+mePDF 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_off0000ed5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 10736 bytes
SHA-256: e7776c65647d1d45329ad55a3af434087a8b3f6b22319c3e0dc44c121b3e0e34
font_02_sfnt_off00011de2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE2 17012 bytes
SHA-256: d8d7a0771bcf50be5612aa3b0c4d6ee5b52bdfc7be0b4a2e447474f275ddb57f