Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d09c968a8d04b7…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 09:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d1b807d31a119a4579d457c4ca54fe5 SHA-1: 7caab805e09d2b0b9df3141f46cebecff52c603c SHA-256: 86d09c968a8d04b7180db9f5e89d5f9fabdd9a112836d1699aa5352a4b94542d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting a phishing or malware distribution scheme. The presence of numerous unknown URLs hosted on potentially compromised sites reinforces this assessment.

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 https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a32b1a17e---wodewimeraxuj.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12a876ea09---difanifazemusufub.pdf
    • http://rustproofingottawa.com/userfiles/file/88948047447.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/m8iaq7uub31vo5c26j422eui1i/jozeretigajelonujitut.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/m5pnepuo0g684scbrolqdq60bc/jideta.pdf
    • https://caribemed.com/userfiles/file/zowupu.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8229ce71b1a41c8637bdf9b51976abb4/sufeguzenolirivodesik.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/62437b394fc5c1d0a34be72ac9b85594/dibivivitepigaditunubesem.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f56454f56---gawilexaravuwax.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb55e9a139---87566479422.pdf
    • https://bachson.net/upload/file/bibaz.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/87vjrcj8guob0uftg5c8e5u08a/luzas.pdf
    • http://irinka.org/ckfinder/userfiles/files/70592062284.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/hqigtdp3it3qq9q07e98jt3p8m/76488500139.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/eoqr6dpc9qh56lnr2ohsjnqhbm/jinemovakututojuzuzigotu.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7565d2e12d---leropisogagabaduwuv.pdf
    • http://kotolantopeni.cz/file/80452530365.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe21d0b3d8---69560297910.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2882a6b4---85616232724.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/7205b2a96599becd41718d8c5300392c/monejunedoja.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/773mu070923hqq7rk7u2hfje7u/temuxuvazababanuwite.pdf
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/nobozagipe.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089c8f9d6e29---fumuvomapubu.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/f4mt667ubkhbd4emp1do2hgurr/28508692225.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=group+work+evaluation+form
    • 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_off0000ec7d.bin
884691c0dc271cf38f8b7010c75984d016dbb884309f8e4f1ecdefcd8999bc3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 10736 bytes
font_01_sfnt_off00010534.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10534 16792 bytes
font_02_sfnt_off00011d46.bin
f6b969738f057fdaf6e7ebec1c5be2711058ab88d0dcb0077240ab334b95d7a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D46 16684 bytes

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