Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88ea5e978086de9…

MALICIOUS

PDF

88.4 KB Created: 2021-07-23 13:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d0a0704d60d25e16e74596a513f5fe4b SHA-1: 153cd2c218885dcf2f6137d753b11fd1d5d55a7d SHA-256: e88ea5e978086de9769943102b53b8dce76b3b4be7e6f064c56f1961b850187c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the overall structure indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://tahitotfalu.hu/ckfinder/userfiles/files/43858694615.pdf In PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa5647e69d---83515958621.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/85865274608.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/46826490191.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24fcd84a5---mejisonarakafa.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/romomemilufaze.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/18681393128.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/34787160340.pdfIn PDF document text
    • https://itacademyindia.com/ckfinder/userfiles/files/96482772878.pdfIn PDF document text
    • https://aokman-drive.com/d/files/fesilinik.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/13430675093.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/859e4f8a2df96dc0f16a3524d728d9ce/zajijimigo.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/s98od3lf55gg22rlafi82a5dj1/2460336569.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/gududubojizaxi.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/91438389735.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/xitevajodigifelaz.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c4e4c9f346---dedon.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e94d0e763d---24818385571.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/jenerikudet.pdfIn PDF document text
    • http://ymy-tea.tw/upload/files/jogapugafobon.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/89047778776.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c3609a220dd41e8472b98f835e464b74/64695065424.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6001975df---zosanojagepirudevulum.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/fe24c1e23f6320f123da32d70e851bf1/38351186257.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/0a957f75535baa4d86d55ac7440bde47/28925156758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=seven+deadly+sins+chapter+291PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B02 17856 bytes
SHA-256: 0c9420e8907f83590b5112395137b2ccc4a84bdea4b373b88cf0b40a0618642a
font_02_sfnt_off000139ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139EC 11088 bytes
SHA-256: 67b7428aa70b31be468a6d2407fc4200c46ed799ac89649a0f53b18c1a74fb20