Malicious PDF — malware analysis report

Static analysis result for SHA-256 2798a15b466274c5…

MALICIOUS

PDF

80.6 KB Created: 2021-10-06 03:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5b95b8959b6b5dfd595dc4c45bc9c87e SHA-1: fb3a6047fa0933b792af67cbf056d64201fd776b SHA-256: 2798a15b466274c50b5e816e223c02bce2e5b34fdf832660db40380794fa2620
204 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains multiple external URIs and links to compromised CMS uploads, suggesting it's part of a link farm designed to redirect users to malicious sites. The document also employs an urgency lure and instructs the user to copy/paste content into a shell, indicating an attempt to trick the user into executing commands. No scripts were extracted, but the overall pattern suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://queure.ru/uplcv?utm_term=thanks+a+mil PDF link annotation
    • https://nls.vn/upload/files/gokikusidajuto.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/letipupi.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/e1b246662c0da61fb027e2ca9de0e900/61765528574.pdfIn PDF document text
    • http://gewidor-gmbh.de/uploads/files/wuzexukitosa.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/17370961102.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/bijixepasapojopusebu.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/jegevevopalusurudokugo.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/jerofunaxunonir.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/91922578091.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/bmoto6p5c7lampes2kh6n6576g/42010471572.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/tuxenomesoxipibafoneti.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b64a9cb0a---xowipulemobatenonew.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f116dcfe5e---35258441147.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/166636578.pdfIn PDF document text
    • http://humanlitech.com/files/files/nesiwoliranufobe.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/14270796884.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109130931373692.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/87928323617.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/godoninuvajizijotaxo.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/neserakurevarudezitunaxe.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///pejej.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/lutem.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/jaxezaku.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_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 17840 bytes
SHA-256: 1ae8a8658ca500978749cb6a42087ef34de988e609d1f48ecf3714e96c567ef8
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF4 9976 bytes
SHA-256: 731542df0a1a2b65b2d7d9a9fd11640bc6077dfe7734464a7cb7aa2b0f5bb5ff

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