Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f2430c48c2c154…

MALICIOUS

PDF

88.3 KB Created: 2021-06-28 02:58:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89e02e8787a6a27989d2b39f9fb44e0a SHA-1: 48d26f28fe61845ca77f402817a2303bbae3d22b SHA-256: 36f2430c48c2c15433145ac8ca3ba70333ffed6c5f33c3c5114e76dd4482b25d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external URIs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded JavaScript, though not fully detailed here, likely facilitates the redirection or further payload delivery, aligning with T1059.007.

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 https://crysiq.ru/uplcv?utm_term=adrienne+maloof+and+paul+nassif
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/dd429736a245bf98826df712cecabea2/63723763552.pdf
    • http://riverbendhay.com/clients/4/4e/4e1cbd84181290ddb66fb035c9950ff6/File/mijosarawiv.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5aaa7207a---bawajos.pdf
    • https://flyags.com/editorResources/file///doxelugapotusejin.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/9ebac8ca44ec96049d6a872c62358358/89066145715.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1f01ed5e9d3483788f3438f9021e1129/68595271169.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/76814c628777b279176821ffa0cfc390/kofumefiwakawapon.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/65569f74b376629e46715ec4ad593068/gafokagujapagefesalalas.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a455256d156---34706612424.pdf
    • http://moreit.ch/productinfo/file/kobuxujesupalirovunemugu.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/4805eb52d7ce29663b43e5efd38f3efa/73807328810.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/s3trsvpq33bum46l8b4i98m4b3/99616545972.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d831f061b42---56269361034.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5fb4f644488edde07be683ef296e0cca/gotidamidotinu.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b90704b133---ruxewuwanunorosereforatij.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089dd21d9697---15926646359.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/fb66a4c7d4528d9a92d349018a50abfe/valogibusan.pdf
    • https://aymfly.com/aym_image/files/kabivugaguporuka.pdf
    • https://akbaturgame.com/calisma2/files/uploads/pifobumibidezilunofumaku.pdf
    • http://microcement.ua/userfiles/file/nolize.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076778e04a6a---mujubijupor.pdf
    • http://cheapmarkt.com/userfiles/file/88914941045.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beb3d297a13---8749600361.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608771f4159cb---sewekutapezerinerolema.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9018032e3---vidusidelidalitolo.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_off0000f4c3.bin
f4cf23ab73bcd1847585f99c55fa0d9f85948b76d61fd780b88b1fb0ae1baa19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C3 10644 bytes
font_01_sfnt_off00010d04.bin
ad56d9af3e212c66b7a00916494ce6f1545b81e64f2406cf25accef41c254ed8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D04 17400 bytes
font_02_sfnt_off00013a43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A43 16792 bytes

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