Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffafaf1507691cf5…

MALICIOUS

PDF

99.8 KB Created: 2021-09-08 05:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ba58f876332da098eebc6c27d220fa3 SHA-1: 0c49ff4b55d93fdaf1e013ecec79decda00c2778 SHA-256: ffafaf1507691cf52fc05103cd4303d4984426662737297297127fe90cd6330c
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these compromised links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1610675199151f---48996927349.pdf In PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754263125c4---61516270617.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/92185700094.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/791847cf5952579f3b0a0c6f8ab349a1/wekoza.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e723121d6---43908615090.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/mesijevezisejizu.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/ruletupef.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609605e8dbd86---12120342036.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/62437360293.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160c27e59d35c2---26957871698.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/doriv.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/98632929878.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fb23d62ce75d4861f878f18dcbb8150e/5891704219.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16095d190c6b22---4533967068.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/wokisejavofojugozilewe.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/zujeropesavixowezokil.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/76430702518.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5051f3c18---wexape.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qgcga5llktd8bdnr6vm6gfki75/jadufaxidezalufetide.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/550ceab1643bcbed9fc272811c95fd5d/14580634982.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df38b139eb9---96894894999.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/2e50d9ebf8d49fc4b4302dca9d8314d8/posuwutosupob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=food+microbiology+practical+manualPDF 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_off00012287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12287 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A99 17936 bytes
SHA-256: 90038769d1f1bedfbea4e7813f7f5fe921895284b97bc87f80cb97d278e31854
font_02_sfnt_off000168cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168CB 10888 bytes
SHA-256: ee99a5c38dff9d29941b02735289a79312d71eac6146e9422543fb48c047a476

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