Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d0f78a03cff72f…

MALICIOUS

PDF

91.7 KB Created: 2021-09-03 05:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2537868b3ff931cf2b05dbd912b43290 SHA-1: 0b6eba87fb160a3db1aa8e533d5ebfe4f3aeadc4 SHA-256: 91d0f78a03cff72f26ff2402f1f943f9555d22fd9e94fc2d4d9d7f9c24f279b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains a link farm, with many 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 the nature of the URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://enjoy.sk/editor_uploads/system/files/35039657679.pdf In PDF document text
    • http://www.knickmeier.net/images/pageimg/file/8052275659.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/39b36d9ba83753ed211dc4be54de6578/tosotavavoxareserisit.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/32342706773.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a04a8466e14---39520951607.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b34ce6161f2fd7a8148bf12f2dc5a446/49481811831.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/srhr6dc8la2ssa05a0scu5pcp5/74616082293.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/65542956168.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98ce66fcfd---26666345461.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/17534952467.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41c80f27de---lidabulapuvuxadiro.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/54825046240.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/80966929400.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/miwareni.pdfIn PDF document text
    • http://foodchemsino.com/d/files/55584033095.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/nusuzupesimixuri.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e34be00a5a---8651671737.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5d83c61c---71431537812.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xemujemexonewamixebotiriw.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/fuzenirukinuwibajajupu.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/91018173420.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/diwulupedizofuk.pdfIn PDF document text
    • https://iasvn.org/Images_upload/files/2628020801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cookery+grade+9+pdf+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_off000101b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B3 10804 bytes
SHA-256: 54f577abeafd1bb0c9aaa15f6e5c0a01d4032325ff1fb7ade7e40856c1f237c5
font_01_sfnt_off00011aa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132BA 18120 bytes
SHA-256: ded50972b0bfc7ed6b0dfd1b11f2ae2d8101485ec6ccb1316ac318cdc818f39e

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