Malicious PDF — malware analysis report

Static analysis result for SHA-256 c852032872b86443…

MALICIOUS

PDF

91.8 KB Created: 2021-07-02 16:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d0e9b41d949de17e56d5d48239ac787 SHA-1: 53ea72aee48d10971cce194395d27240796c1a57 SHA-256: c852032872b864437db358d63c8732f92dbc0ea40cd7b64f57c34402b52d3ca8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised or disposable domains. These links are likely intended to lead users to phishing sites or facilitate further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://perchegouet.com/ckfinder/userfiles/files/tabujubakesiwog.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/50c4888cb10fa9f4dd3266991ad9d3da/33288589324.pdf
    • http://renovfab-menuiserie.com/userfiles/file/74396156183.pdf
    • http://dui-antidote.com/images/userfiles/file/jifukutadunuxuzipab.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/lblgjabpqaqahpmk6k9e05dn82/ladumegivires.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e4f920838---bigaxukasivobupowuvezagul.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/427ne6g61dh8q3qq1lq36d73f7/65359179281.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/qlofmprlglclv99vf5nbkr08nj/dudekaxinilefadowamogejop.pdf
    • http://cokhiminhhien.com/media/ftp/file/61537331456.pdf
    • http://jpind.pl/userfiles/file/jufajasixenivexi.pdf
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/42kolubv906p4fghses2i88g55/puduteru.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdaae518ad---tufukugomagepowejexokasud.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/mn8eg76n3vd8u1eg43je6o6kt0/16560121299.pdf
    • https://stef-nancy.fr/upload/document/19018787986.pdf
    • https://clifestyle.net/uploades/userfiles/file/rilejiwuvuzugerego.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2e41ffac191aa0f138679ecd9b9aef8a/kawitujemowol.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dbde82ab9e8---jetovaj.pdf
    • http://assotechne.eu/userfiles/files/tagigejumer.pdf
    • http://zgkimsteszew.pl/img/upload/files/wurebiforof.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608095cc2f521---dasapopesowisojevi.pdf
    • https://parklanehotel.asia/userfiles/file/puvegafenewazanonevuziraf.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084853120b71---31387813407.pdf
    • https://maturana.cl/upload/file/jizadidedipasuxagubuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=oracle+sql+tutorial+with+examples+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001024a.bin
904d000cd0b50520f2fb30e291ff40f95f52b06978a47445c16537b9cbbf3229
pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 17276 bytes
font_01_sfnt_off00012fbe.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 16792 bytes
font_02_sfnt_off000147d5.bin
64826660c4f4432d6d7a2ab7d84ee2be77dbae4faecdaf7c36e4279104011714
pdf-font-stream PDF embedded font (sfnt) at offset 0x147D5 11240 bytes