Malicious PDF — malware analysis report

Static analysis result for SHA-256 4015b742a4e5fd58…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 03:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd144b83fa4bbf6c03c41311bcad4f43 SHA-1: 6a929af187e46a018ddc40038ef59729a9120b96 SHA-256: 4015b742a4e5fd58942c469ee9f42d35323a8a4f4d86a96e2be5acd9e42b0710
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=long+vowel+sentences+worksheets PDF link annotation
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/c8b8727522d840912fdffb4d31d7e123/rokomovofe.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/fipasinadorofaxuxonebe.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/releleseferes.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/fakogavevasobi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a215508f2752401f6c5c30b0eede84e3/40297500816.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ee4a0c0f---xavinalamepuf.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609152ad4de71---71211607263.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56583edf9f---51691369837.pdfIn PDF document text
    • http://www.biotanika.pl/upload/file/wibuvulobabirepijin.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/54498056334.pdfIn PDF document text
    • http://klpa.net/userData/board/file/gukilesar.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/3trk4nh34rev2lcbdh8v9lpso1/pagak.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/170705207259.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/99990363725.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906150909.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/xoxaravivotasozibasurona.pdfIn PDF document text
    • http://sartor.ru/upload/files/webubug.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/644fc8274229dd138f93937ca33bcee8/66411781805.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a67ed02c2fa---pujigaxu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b133dba1419---57872681531.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/bukedovaxofigejodajebi.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/27115557661.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/xigetifu.pdfIn PDF document text
    • http://graham1978.com/clients/79565/File/lazebororulezej.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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE058 17064 bytes
SHA-256: ffe0b9bbaf3e0e86834912f2b5d1b21356017ca83b79c3559001e929666b0d8f
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 10456 bytes
SHA-256: ea63ec439728a1282615e5d47a5a89fdc5d2b70a11bcfc0048c09ddce2d16bda

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