Malicious PDF — malware analysis report

Static analysis result for SHA-256 259c31bccb466c54…

MALICIOUS

PDF

92.9 KB Created: 2021-07-28 14:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: de9670f37d439c11f0cc44bbf52deabe SHA-1: b568947d2b2ab59644ded4d32343b373d2536d01 SHA-256: 259c31bccb466c54a77962f0925f32c2cda566b361999119fae53d31918dedc2
156 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5c76e48867---xezedepovalaw.pdf In PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c11c9221eff---jewamavid.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/731392j9fhspd429aht2i9n841/87902237697.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/opf00k154khp510l18ef2uafse/9233991628.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/15882799500.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/1d9e2d7b07a556708cb2042b3931db9d/sutowekodugidagatipesas.pdfIn PDF document text
    • http://dearbornshs70reunion.com/clients/c/c6/c6cacd1d9512a3effe7244eb89d69e0e/File/zafirorejedos.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kujoxusomunimapebinem.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/711d9ad35ebd4adacb109d69bac5868f/31757410166.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/234332690.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe068a4dd1---zobagazonox.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6jco1gi98gf8sbjmq2fp0gfrj4/pizolapefipitosemo.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/c464e5541a7cdf10281f7f3cbf83fefa/wozorowikisefu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716f919945a.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/rebanoxiboreverezeni.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/delulivotewusotowimedawe.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/rofujoxix.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcab8b5044d---81953111422.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/99548632069.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/wojavuxekiro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aggressive+fat+loss+vs+warrior+shreddingPDF 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_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 16988 bytes
SHA-256: b40539397164d6243591efc0e128dbe62c447999e9b788decc2eb9af5a25fbfe
font_01_sfnt_off00013368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13368 10768 bytes
SHA-256: ba8940668f99149ff75cf776b0e9c287e0a5283d8d87492b4dd202c68eb2d073
font_02_sfnt_off00014c00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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