Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ddb98c736731bf3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 14:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a97d83f69b26396d0a98b673f2aa0509 SHA-1: d425bf77983eeeb85fb585bae180b40c1819f4cb SHA-256: 2ddb98c736731bf30666ad468202d83ed6db5b4efc78ca2d868c20f58f742171
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://medvor.ru/uplcv?utm_term=h%26p+template+medical+student PDF link annotation
    • http://zlato-invest.cz/upload/files/21205978540.pdfIn PDF document text
    • http://camonetinternational.com/files/file/fotobavinexuvojerav.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fafc7dc75e3---xuduzu.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/95082668220.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/zejebusizizevosifevotov.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc9cf861c8---27917714027.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/e1cb587f94ca809efdb577d18744df64/5762071020.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609668e8ea29e---2037045756.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210802011704_uprk6w.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/zozewumog.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddf88592b---83059053062.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/0be11b3972870962d08b8f13883f854c/barol.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/53067202930.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/47891813544.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2ae16fa2f3417adac36afc09288ea212/50409379672.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e0a123e4e---fidanilix.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/gojazilajubajevile.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/leniviwogozina.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/bc7j7iqbo241g0jm66fs2b9uif/tovizawetasalixofukuza.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/jimugewobefo.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/tadopidebasijixuxotidumi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5618b8a581.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51634001171.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/83477071509.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/mojibamofe.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_off0000f338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4A 17600 bytes
SHA-256: d87948b1c13d6b0c08c53c6b29b9c333a4a31a07f1505b580a989ddb6fcbd9f0
font_02_sfnt_off0001391a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1391A 9064 bytes
SHA-256: 591d9d01fa162a63dcf956bf9119e00b238dd1a96502d52d46b633f78bbee6c9

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