Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfabb2665feba9ba…

MALICIOUS

PDF

108.2 KB Created: 2021-09-06 19:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa12978a9a54edd1628d35885a61262b SHA-1: 388974dda734b4d60b7037182254599243324fa2 SHA-256: bfabb2665feba9ba0c6272882f1cd21980af4a575c6f31d0017fdc2d4feaf742
196 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. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a shell, a common technique to bypass initial security measures and execute further commands. The numerous embedded URLs, many pointing to compromised CMS upload directories, suggest a phishing or malware distribution campaign. No scripts were extracted, but the overall pattern points to a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://coretry.ru/uplcv?utm_term=fanuc+robot+programming+guide+pdf PDF link annotation
    • http://timnhanhonline.com/upload/files/93277183689.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/34815214315.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/002e588797fa8b19729c13b60aac0ede/34790981111.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/uvu5mol5vc4l4do59462tmv03k/mivobixorojoponexup.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/ruxedapofubajox.pdfIn PDF document text
    • http://bamor.org/userfiles/file/pibugeridaze.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b429e238cc9---taxuladigud.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/62631287288.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e625fdf88807bcbc9092e7749ac79738/80576426633.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160808d1dec3b9---wigokexuvap.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/93811991575.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/ronuvusegoxaxavadepef.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/6a57a12020900b22e74a5555b7f056e7/xapolimetokumopupe.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e7a15497---tiwataminosetatijas.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/63621469950.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16075784d3b0f8---85943575028.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/96129146220.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/setuwadaguwoj.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/dewiza.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a14657e4---xitetuneda.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/99606062812.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/jubodasiwusozifulefuxa.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_off00013f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6B 19208 bytes
SHA-256: 27cefaf9cb292ce1c888e195b1a4f1872cf8a9447f85ccb6dce1a558307cfa6e
font_01_sfnt_off0001720d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1720D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A24 10968 bytes
SHA-256: 660a9a8eac9702fe5c25f6e93bdf7a8bb9a6e12597ca2cecb7c2aa4303349c8f

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