Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c4d712d1bfa7df…

MALICIOUS

PDF

92.7 KB Created: 2021-06-30 13:11:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0e8a3bb95162470b3808d208776edaf SHA-1: 571b6384ac7816a5829d6dd2a4d6b2de65d5434a SHA-256: 48c4d712d1bfa7dff777e545e93e7db86900028dd433c5b51d4de0e31e1d6b41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external links is a common tactic for delivering malicious payloads or leading users to fraudulent sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://cructi.ru/uplcv?utm_term=the+answer+is+yes+and+no
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/mo8lps8mbafv46lb7h5vlitka5/zuxujomobaxisutajiwojopun.pdf
    • http://nnrhc.com/clients/9/98/980d61ede38c9a35fe3396fb65651545/File/mosake.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/98af2b101b17eb6c5e61235235332c65/pazevosujimosal.pdf
    • http://mileschapelcme.org/clients/9/9b/9b85db73e8c1d5ae3bc18b6db4f26039/File/xepobonogenasakabufuvivi.pdf
    • https://nicosiacaffe.it/file/pokuba.pdf
    • https://cplastik.cz/data/cms/file/dafelowakoxojavixajiv.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/92h5sbrc49thd7l76oo7bgfbf0/nelepabanujo.pdf
    • http://theettiaresottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/wawidobigetigoxuvolen.pdf
    • http://alphasigmaoverseas.com/userfiles/file/sozufajulilopo.pdf
    • http://cornucopiafrederick.com/uploads/files/77393420936.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85c4b08230---fusoxa.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/4b927c3e5b675298f9954721bb1ba051/19917377894.pdf
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/71299686480.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da5e6839a15---61962489904.pdf
    • http://sns.hu/_user/file/61227591918.pdf
    • https://irepairplus.nl/app/webroot/files/userfiles/files/sudowudagurenane.pdf
    • http://vce34.ru/attachments/file/muwuvedetak.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ee546c6bc---likuvisananu.pdf
    • http://khanaphatgroup.com/UserFiles/file/98644518366.pdf
    • http://cokhixnktientien.com/Images_upload/files/mixib.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a09673ad33da3a9cefa04c8cf767f9cf/71022072656.pdf
    • http://phs1961.com/clients/2/29/29da8dc1278d8f1c58a3d16208bcb4e7/File/dufilat.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e960c69173fffab78e3498b7e1fe037c/tepetiduvumironu.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/nolixalewopilafog.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d325284ae91---sudeditej.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_off0001073e.bin
7e3fd3677be496db87f1347bc7d8ee3a7aba62def3b32498a6867595890b15aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 10364 bytes
font_01_sfnt_off00011ea2.bin
3d92071e6d3795c246344487dd92591c4304f414371f9156f14c65308be43556
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 17960 bytes
font_02_sfnt_off00014d8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D8D 16792 bytes