Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3080b6b9507543e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-29 02:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f6fc91e3c7b24eb043a592124b2833e6 SHA-1: f3dafcd89b982757d1657e468ca66cd53e6eb2e4 SHA-256: f3080b6b9507543e1ea821a7be1fb010788faed0dd4ed4952ee355e17b3a949e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the presence of numerous links to PDF files suggests an attempt to deliver further malicious content or redirect users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316c3aef923---vinomubo.pdf In PDF document text
    • http://oookub.ru/upload/fckeditor/file/73409473545.pdfIn PDF document text
    • http://ocung.net/img/files/rukikatoxojivoledut.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/gofosepijixoda.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c81cd39a0.pdfIn PDF document text
    • http://my-hustle.net/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/57573378598.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c63809e298b72cf49f7140bfd77d6183/55976090045.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/nidepixelapopumiviwid.pdfIn PDF document text
    • https://alwaysthesame.pt/site/upload/file/93023172603.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/42884414479.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/93730492738.pdfIn PDF document text
    • https://morabia.fi/images/file/57662046365.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/79993650907.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109091237587597.pdfIn PDF document text
    • https://auto826.com/uploads/files/jetik.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/62832571747.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ff434fac---penakana.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/15138261784.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/161526935d9d44---bisenulojolise.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/76809834048.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/94376418074.pdfIn PDF document text
    • http://pasat.alehotel.pl/userfiles/file/22561390718.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/21169430320.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/nonovowe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=luigi%27s+mansion+1+apk+android+downloadPDF 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_off0000b259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB259 19480 bytes
SHA-256: f76ce7e218528028660251b4ff3281f592ed12503abc2e50cacbe54f7a8d2b51
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEB 10824 bytes
SHA-256: 54a54cbc961119a8256c048d8d8ad642eb7cefd888ead530435ae479695841b6