Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ef5207ced5ac74…

MALICIOUS

PDF

69.1 KB Created: 2021-09-27 08:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3d83e79598dc79e6440587f19dd59ac2 SHA-1: e834169417052255a918e5ec55e97c176468dc25 SHA-256: 59ef5207ced5ac7423d020f59f19e1d8f0c15a1a13bfbf2050bcabf91b55afb8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the download or execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe7de2c021---buxutowibazijapade.pdf
    • http://ajtoablakcentrum.com/_user/file/kilegowisiwuxolakumat.pdf
    • http://rigosarchitects.gr/userfiles/file/wemibasugivesomeroniseto.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/21f916cde73633d386b042d3a73db54d/wibivalefezebikeginud.pdf
    • http://hide-bo.com/img/tmp/file/71274778226.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb17a6ec3---jamudorad.pdf
    • http://goodfortune.hk/UpLoadFile/file///77950775509.pdf
    • http://igigeothermal.jp/userfiles/file/38911579242.pdf
    • https://songod.vn/uploads/image/files/31231317374.pdf
    • http://186086.com/upload/files/mirojofokanorizazivejo.pdf
    • https://ms1oke.com/contents/files/wojosubikezumebab.pdf
    • http://babyshelter.net/assets/upload/files/98520906952.pdf
    • http://hotelbasantresidency.com/uploads/21432915003.pdf
    • http://www.mousumibanerjee.com/fckimages/file/welomow.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/c91vpq19p0at0l8an6rkulv48g/23367084870.pdf
    • http://mackyz7automotive.com/js/upload/files/18884030525.pdf
    • https://btsis.com/upload/ckfinder/files/4143929946.pdf
    • https://sunnyrosesschool.com/userfiles/file/64370441282.pdf
    • https://bataretak.com/img/files/file/19587737806.pdf
    • http://papianiarch.it/userfiles/files/wevizapekod.pdf
    • http://ibconsulting.it/userfiles/files/wivisaxe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=transfer+images+from+phone+to+laptop
    • 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_off0000ac87.bin
9e142f268899158e49df3660651ccede74c18f896f9f4b693e3d8c6109018f13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC87 16520 bytes
font_01_sfnt_off0000d67b.bin
e290cce36a980e56d10a5ad7e4dd1bd000bb74146bd2903262e1da7cf98860c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 10768 bytes
font_02_sfnt_off0000ef0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 16792 bytes

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