Malicious PDF — malware analysis report

Static analysis result for SHA-256 da351ccd52f932f0…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 01:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aee8caee4efd4d1472529fb113308c95 SHA-1: 32d39c77d86ef298654b247fe33e5184a4041850 SHA-256: da351ccd52f932f0e07980d4516e92207d500222daa795878b3d8de3c7902151
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The heuristic firings indicate a link farm designed to distribute malware, with one specific URL pointing to a PDF that is likely a second-stage payload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=school+application+for+absent
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c4092c8bbb10dd39749b4e32cc220ce6/84281851422.pdf
    • http://thankschicken.com/uploads/files/3441072549.pdf
    • https://nepalipublisher.com/ckfinder/userfiles/files/letapu.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d7a917824dae7aafd5ecd2c7ace69a4c/65984569495.pdf
    • http://archerelectricsupply.com/userfiles/file/netojigosawopovu.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5bd9c697a---77809161895.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/6f98c0c81941e24c5d303496bd5155ea/binatukepojifofimaxiraja.pdf
    • http://toyotarentcar.net/FileData/ckfinder/files/20210618_42A5888D2D571B7F.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/e58662a1186ca8b6838520171e00a354/44644703013.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a46d53738---lijuzewazobagojelomirim.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/9kekvv8f5so3jbf0heclquvvj4/pobola.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6a8f055e7925e43085843463f85481e4/wosuzigasiripupirofaba.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2a09b7b534d109627c874b41d6df95da/58646922747.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9d2f6171887878d177efb690321ec7e5/27053852814.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9fd8783bb3bbd416f8d063d267f8cee9/midakokoxalaxuvedemewox.pdf
    • http://hoacanh.net/luutru/files/napawetefu.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e5e54be2---ridusofafefunumom.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3bd35b440---kutimositeve.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160960c493ff83---26903688987.pdf
    • http://akcjonariusz.com/UserFiles/file/filor.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e982cb21---31529639151.pdf
    • http://orchid-daikanyama.com/userfiles/file/xotof.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/pusogidaxoserexuzutim.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be683ae40---vuwisiw.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/limedax.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1fc5c1f3b748dbd931b03718a84dc7ec/xurokepalojilogefixedefi.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_off0000ee1a.bin
f165ed5888986ce035fee9b9119e1aa6406fdd0d7b33f25597bd5f96cf98f93b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1A 16112 bytes
font_01_sfnt_off000117d2.bin
ed192e77fc09a049abaae7e007c3d15abc4b2f521f97f30bf73a42b5874ea47c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D2 10792 bytes
font_02_sfnt_off00013062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13062 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.