Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e977a214fe6149…

MALICIOUS

PDF

75.7 KB Created: 2021-07-26 06:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9576dbb051aaf642a3535d2384be34f7 SHA-1: 9fcd3337611739a5d3ed39fbe2b791e6a229aa15 SHA-256: e7e977a214fe6149c3bbc3f5a16f86d95f1175a8c345c951b87f88b55ea58941
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised or disposable hosting domains, suggesting an attempt to distribute further malicious content or conduct phishing. The PDF structure and the nature of the URLs strongly suggest it's used as a lure to direct users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://filetorme.com/upload/files/jamilanutamup.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16072d38e5a586---93962497586.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bc8c59c34---xobarabakidifisamaz.pdf
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/57293237332.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d811f9091e0---82340785320.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b055d7874c5---79071646996.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/duf12nmlernimovdq9bp5l1o9m/sepefekaropujazavoni.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160bf3bf38436b---wudatoj.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/53c0p9d60h2n5fjrt3cc2r94p0/12896521732.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609743ff37ee2---78618424275.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5d4eaeac2---noxarosovuviduw.pdf
    • http://growourworld.com/clients/83159/File/65508069209.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160acbe413d1e0---lamuwovirujumazofumunofow.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4485f3a42---70835615987.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/e8b3a515c1f4a40f39b414f8ca072786/65918829736.pdf
    • https://cissud.com/uploads/ck_editor/files/51629726346.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bfde0233bd0---63871156912.pdf
    • http://gelikonline.ru/content/Files/22283581688.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bbb6b384f---81934172010.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e45e2e9bd03---kamozakafaviniv.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/2e61bf40623d55342bcf7c2b1739af6e/zotowenotefirebobew.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/8rl8nfgf49ph5aujnf9vuju346/37016846299.pdf
    • http://vinabomi.com/uploads/userfiles/file/mutojaxubuvamusiwiduvivo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=verbs+with+prepositions+exercises+isl+collective
    • 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_off0000c638.bin
52d78e58becc3097f971512ac9e6bbd24592df070f5c48a7fa430dcc724a03d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 10672 bytes
font_01_sfnt_off0000de7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 16792 bytes
font_02_sfnt_off0000f690.bin
a073e1af418b9562f4a820c89acffe50b71b434d9ceb2e15bd84ea1d80a5cff8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 16192 bytes