Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad7dd58110687a5…

MALICIOUS

PDF

86.4 KB Created: 2021-06-26 06:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 57aed0d1aefc6938181d09bb82bb27bf SHA-1: 08f3d364eccfcb63cd1240873f340eef5d1d0d06 SHA-256: cad7dd58110687a586b3855f2bee71e93bdf6be1cb34001c5bea2015893f1673
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/3u2lmmuvuggm1hp3dmo2evmaa1/20137266883.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608496e05f0ce---sigaxuluwinijagavabek.pdf
    • http://france-ex.com/images/blog//file/saxadulixezap.pdf
    • http://congluc.com/upload/files/tugisejijesudevi.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607253e2de2fc---12185937515.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160838377ddc96---34184804141.pdf
    • https://akamercedes.com/images/uploads/files/50149899593.pdf
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd7783cb9---garabubamupubilusapij.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4790dd9a3---zefubas.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/73448314669.pdf
    • http://compufoxmail.com/userfiles/file/zomomuwuruwuj.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/f1ec7f3dcabab5a26fd7cff1ea435521/boladivaponasabobi.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094124d7dc95---rolezij.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/wezuledepumeguso.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/fa1c9f6385013426975bd72aa260fa05/73762111010.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2c2d98a19329c11768d89169a03527e8/73602517485.pdf
    • http://aj-logistics.com/stock/userfiles/file/97994302644.pdf
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2ca9469518450bcb80be1bd5e4e5951b/xuzowajanasafotik.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a2115fce11f---32825514965.pdf
    • http://czdashan.cn/uploadfile/file/2021050319421073499.pdf
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73377909202.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160834b542c627---8445893292.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/48211620955.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c39ad17bd5e---dewab.pdf
    • http://4bx.pl/public/file/34916317899.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/898200b0532a8eb3efd2e4c4dbbff53d/vavarofewonokojisuzov.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+replace+an+automatic+transmission+with+a+manual
    • 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_off0000eb1f.bin
bc3bf661abb335d4ccd42eeacf6317939d486a4c7739217cf20b7ebfa8540453
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 10816 bytes
font_01_sfnt_off000103e0.bin
d14859c858a69962513c5a0dabf675337242e2833475d8c9c1bffa290669284c
pdf-font-stream PDF embedded font (sfnt) at offset 0x103E0 18172 bytes
font_02_sfnt_off000133d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133D4 16792 bytes