Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a72ef3d281c9bb3…

MALICIOUS

PDF

95.4 KB Created: 2021-06-30 01:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df404541116cab2e57b09c95146ebf80 SHA-1: 878bce93545ae6f880d818f28e8370f7b947bcb5 SHA-256: 0a72ef3d281c9bb38de710d3e47d729cc31dfe8822504fcb4fc699dcd5c14d65
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160985b391a24d---72128666984.pdf
    • http://gramercy-grand.ru/files/file/29677141863.pdf
    • https://grandhotelbulgaria.com/userfiles/file/dipomifafijimufakurunu.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/l6relbnemvfep6125ncc9ova9g/seridudijewatutojanupa.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/e37a74a04d414d7268690c8b892baa1e/fekowofobuxalawix.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160802f6acabdf---kitinopitabatezudiginovuf.pdf
    • https://alatheir.com/atheirwsfiles/file/mobogezibaja.pdf
    • https://toskov-yordanov.com/userfiles/file/banafulejexutobuteliredis.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8753be5877621977c2cded758aef36bd/51284055711.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/futago.pdf
    • http://rocb-ap.org/file_media/file_image/file/6298690618.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff619a689---15567719373.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/89f5fc311d5acc173f29ec84795b6a1f/kalarobevemigodol.pdf
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/25fb2f9802029437cf235a62638ff6a0/82090009176.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/f61eb8ffca33298320bf5ce35d204cf5/boraba.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d6c9615e---49396491609.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/d48bc72ded66d0e9d55895d40e2c0882/24318292939.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8261448a6---sunixozeroz.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607500f701e48---nigawimujonekufuk.pdf
    • http://eksan-ltd.com/userfiles/file/85018945090.pdf
    • http://owv-sad.de/userfiles/files/77504672939.pdf
    • http://lmyc.net/clients/875386/File/wapunoseterus.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160807a22359c9---24019419683.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/999fee9b92843d31a555ba3121d8e696/vawin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=plumbing+interview+questions+and+answers+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_off00010f63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 16792 bytes
font_01_sfnt_off00012775.bin
fbb89f52d6edc2c829b8eb6c33ade0404da17b311566d31f4313a03617cfb24b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12775 17792 bytes
font_02_sfnt_off00015621.bin
5f8fa19d93707aa91404bb4a7530cba308389cababd7d1e41d2dcb43c93ad2e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15621 11380 bytes

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