Malicious PDF — malware analysis report

Static analysis result for SHA-256 47604621d2bdf559…

MALICIOUS

PDF

82.0 KB Created: 2021-08-30 14:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fa05fcff61c532487127afee607e4e1b SHA-1: 9725d5031d01e44d8cfcba0702caae62bbf1918e SHA-256: 47604621d2bdf559c239476d81c95bab9af0592017a0b35ca8267697371df489
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://khunghinhdepphuctin.com/media/ftp/file/lomezagodavuzub.pdf In PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/7314462129.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16071a8bc764f9---fukunajeliwusalilojogigar.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/xivusajujiw.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/23e7f1bce11c44e8d0d623870c35b728/73800609762.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4f3833a1f---63462998617.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/40281206641.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/98124048280.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/thulbs5rjmedpfi1dgj8clv3kq/vapakalanalupajako.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5bdea9cd2d---zoxeropajadixunexepofafel.pdfIn PDF document text
    • http://serenetransformation.com/clients/870552/File/jilulop.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a426b7f4061---nupegumowetuzabimiw.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1ec30b314f0bb199bd65b8672e0af63d/32912986858.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/4699dd02c18e05326e7e5759647c7943/34118276979.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/nokofowuzeluwuwukitetov.pdfIn PDF document text
    • http://alkanboya.com/files/file///tefologamotinomon.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/navurozijediralufa.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/95543169611.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/b879ef2b665cc69421eb555bb9f308ee/mifeliruzaf.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/38481822a6a5e15c5a9119968213d945/gelonigu.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/97563901657.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/ec96b9d69b791d580833c99bebdfd144/1826039328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+install+minecraft+maps+bedrock+editionPDF 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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 11092 bytes
SHA-256: 4d2ab3d65d8b71df7abb8df0a228c5737bc8b723dbb7ef8a52194af586228105
font_01_sfnt_off0000f322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 17896 bytes
SHA-256: 9cb6970120192f92865481a45f0d7c1b928a91905075bb8d95ac6e3a027f7fb0
font_02_sfnt_off000121a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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