Malicious PDF — malware analysis report

Static analysis result for SHA-256 6468a70151f3960b…

MALICIOUS

PDF

87.2 KB Created: 2021-09-06 22:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: ff37feae3349038e1c8186189563d415 SHA-1: 2f8a00c1622b3f134c18fc0b8f6409347bd586a8 SHA-256: 6468a70151f3960b5140f9bb282d94c01e792d0af71920e0476377d0a96fc4be
236 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution attempt. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to prompt the user to install a browser extension or update, a common tactic for credential harvesting or malware delivery. ClamAV also detected this file as a 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://drapikowski.pl/uploaded/fck_files/file/nawaduvifa.pdf In PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cc8acbcbc---80683261854.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5683db3ba7---27125855878.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b01d1436091---wakedaxujegepidolaz.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1d93a87fb---7830709088.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/7r5or321dq83uh1cgaarcg6884/64080566901.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091ed9a2def5---12522566980.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/e90bf859b95f01a2b612b2fb048c115a/29774179626.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126f64392f81---17971440508.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/zegetolijovafeb.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4426e20e5ee513b91e94fe76db8fdefd/duxaremilunu.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/10833875821.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f5739820231efe4a968b945156ea0447/92505363109.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/sumuzigiwunuzez.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3f400a3eef9272645ac4a3d4d4b37da7/gipobirerotejavoze.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/41337684198.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/4aeaa3c2b4b6f7b35d7e8ad801ac8be9.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/46511639142.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/80078756927.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/cd43c5b22e2961ccbcb4a2743cdf1fac/76317131053.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/gupujowifenasomip.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/09b3dcd30647369087c2a84d1639b1d4/ruserikebewijuvudodojoxak.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/tenuwixopitasilinuje.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/pulukamofoximalumesowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=best+offline+pdf+reader+for+windows+10PDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/bujij.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_off0000f03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03B 10804 bytes
SHA-256: 500a2cc3d55bdb173ecb8c10d10e50e8c309746b094ac37f5b48a1145ef5c20d
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 17620 bytes
SHA-256: 7c3d7ecfd3b55330d64c707496deeb3abad728059450416a499359d80ea0ad08

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