Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e42d271265785c1…

MALICIOUS

PDF

83.6 KB Created: 2021-08-14 22:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b83f903546594d973bc065bf08348d11 SHA-1: 6d89109bc20b8a388791bcdd89c76d9d17152806 SHA-256: 4e42d271265785c12df5185be284116954ccc7645314a84381eaefe5c5a63605
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be directing users to external resources, likely for malicious content delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/3b8cfk61m7v2ltacto9nruv3p5/beguvo.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cdd69527e---kugadebixivuvuxumejodegi.pdf
    • http://kleinschaden.expert/userfiles/file/kuguseretedemojasoded.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a84211de30e---4365561482.pdf
    • http://espacioschillout.es/images/admin/file/76201481868.pdf
    • http://silesiacapital.eu/data/file/tibomikazigawux.pdf
    • http://evola.it/userfiles/files/vuzuwewufitafujum.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c25862aa133---7316397738.pdf
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/c98c1b2f8d90d38c783a7836e380efe5/nidugusuwas.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160891c76788ae---85179324352.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/4dca0f1a2ebe466f107ac11176de3e62/fosifesunetenirukuwu.pdf
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiruladeroj.pdf
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a2eac66e5---sivibokosidope.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/11ecc45b0754ba0ed88bbaa3705d3305/56483855241.pdf
    • http://mesahighclassof63.com/clients/79820/File/5424270484.pdf
    • http://to-tuong.com/media/ckfinder/files/40777413274.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ab11126a655---babojafu.pdf
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/220433b0a66c6037a54d2865d7c946c6/37934766854.pdf
    • http://fredericjean.net/oplusco/file/woroxonuretot.pdf
    • https://adium.ru/userfiles/file/sonepawaxitusatuju.pdf
    • http://cec-intl.ru/app/webroot/files/file/45174462767.pdf
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/kigaked.pdf
    • https://andrejc.si/files/file/raxokojugilikodal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=ulead+video+studio+pro+8+serial+number
    • 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_off0000e351.bin
96c621fedf9228e2c1d05758efe3d6407bbebc8a6bd7daec71f7b6298011e719
pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 11072 bytes
font_01_sfnt_off0000fce6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 16792 bytes
font_02_sfnt_off000114f8.bin
10a19eac2fd31d00b42c609240ed09bdb72673583d3463b430d7c3979549cc97
pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16648 bytes