Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d1e4ec72eceb3e…

MALICIOUS

PDF

83.6 KB Created: 2021-06-27 22:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a95b87a9586c8f610316b884548905fd SHA-1: 1389ac8f004adaa78028f15fb57bf658dcbc37bd SHA-256: 87d1e4ec72eceb3e86b9d1d429e26ee04623e5b344993ce3f1fa989c66c6b516
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://archism.ru/uplcv?utm_term=persuade+and+convince
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9f2f2e580---rerewegakotusivejigaw.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed5b91ddc9---sorajarafaxe.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c57fef1be9e---negifabaner.pdf
    • http://bellsazshihtzu.com/clients/878694/File/76838069008.pdf
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f95ed462b4---pikejetadimetedugaruje.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/iuka9v7tbv76097i5t80640vq7/80096452217.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89875ec8fd---fimasedomelitofu.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6f3ecc7d0---91800172007.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/eccbcf0750faeb2d5bebb831c3fe4764/92425257546.pdf
    • https://nanyangtextile.com/userfiles/file/rirazolutujifoluramogo.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/f1fe68cdc3b87660decc19a6e70b5f13/24791074383.pdf
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f33734cb33---zelidomifepif.pdf
    • http://zabradli-znerezu.cz/userfiles/file/43215314363.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba095a1e5a---jipixogikag.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160776c242cc26---sezusajaw.pdf
    • http://asbu.net/uploads/FCK_files/file/wadurojap.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606f331845bb5---92079648493.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bc5da6bd0adf69e020b8316fe8ca2e29/ramusugikod.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba152f85639---derovi.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/11rule01f1se9kd7srr8bqinkt/97455670774.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d6f4a4211---ziwaberikijadedag.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/m6qqnn1t666cho4bi52e7k05q3/jujuduvinelapasud.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_off0000e6ed.bin
c3d74a6fbf46588e7894e6262af295fd9a11c8fdff9c3e7f62f80cbf78929a2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6ED 10388 bytes
font_01_sfnt_off0000fe91.bin
3e4c1fa50d959349d8b3caf9e316a102cf5a2eab2b73d414460c99b3de18c379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE91 16556 bytes
font_02_sfnt_off00012977.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12977 16792 bytes

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