Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb15fdaa49ada530…

MALICIOUS

PDF

74.4 KB Created: 2021-09-17 16:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 50297a7caf04c07209d1084af65e23ab SHA-1: 3e5eece7388b16a65828a73022e03dbc1e5bf46a SHA-256: eb15fdaa49ada53083062ff84ebb2ebe7dedb5c159ce9ca8e0fff2d3c7fd52b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, including compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or further stages of an attack. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/352759999.pdf In PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/59012173690.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/72031002094.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/revozerutemiliros.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6143cfbb62375.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/86439022085.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/weloxi.pdfIn PDF document text
    • http://myatkinsonfamily.com/userimages/62505922205.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16141dad05b392---korezuxasogebulifikofiji.pdfIn PDF document text
    • http://arsvet.ru/img/upload/nonijaxotetoxomodede.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/4818755996.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/88028783006.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/10508933519.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/sejinutoxomo.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/45714735016.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/xoperoguxiva.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/suxesoduvonawimasiwalu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/cj9bl3nfj7pndefg2inm023pl5/fafona.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/76322711833.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/ramibowizukumuwadolevife.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/pigosolid.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613651bd2c302---fisalepovetal.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/68fbd5311ae6bf9148c6877c9994052b/lukubipaxavofofi.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/bemaguvepajipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+update+kodi+on+android+tvPDF 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_off0000c1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D3 16460 bytes
SHA-256: 20621b0637247375f8f196fb30525764bb0878b14718b9c0dd701a954eabce7a
font_01_sfnt_off0000ec08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC08 10508 bytes
SHA-256: 02bd646203ad2e09706ca4cc5e65418f6c099c82b6743f002c98afbe10fbbc26
font_02_sfnt_off00010410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1