Malicious PDF — malware analysis report

Static analysis result for SHA-256 538ff592a056a9a8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 07:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b986c36b0f0dcc6cd57acefc1e39beba SHA-1: 30feca5aa539d2460472ed6ac4cf897ea7565cde SHA-256: 538ff592a056a9a8a02ac58cc809a411fcb4e6a4ff40d848f4f007506183d9a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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=full+meaning+of+osi PDF link annotation
    • http://clinicaveterinariamontecchia.com/userfiles/files/purinemumumeba.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/43675567191.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/95448148040.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/dewem.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c132c18aa---13236164732.pdfIn PDF document text
    • http://simoncaulkin.com/images/redow.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614451f0e53d8---vezatosuvopavogikukoke.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/31018877168.pdfIn PDF document text
    • http://c-amc.com/upload/files/dejal.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161466a7a7594a---60005682161.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fojorijoke.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/jovaronisag.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612eeba9cf882---legelegekanapuginipara.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614464041dd67---sajiferafafurevo.pdfIn PDF document text
    • http://flairpens.ru/uploads/file/tulavaga.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/63634922582.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/vopejupujogapejezutagaza.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109091816557371.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kerimugegolafozoxupobof.pdfIn PDF document text
    • http://recviem.ru/img/upload/41618862101.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/wakemomofadamu.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/32642321397.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/dovifasofazi.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161438e5b8009b---63132660487.pdfIn PDF document text
    • 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_off0000d329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD329 18240 bytes
SHA-256: e7bf91b406e1bc30de7158674576812a2ac631d5ee97a0184d8b9098b6cf157f
font_01_sfnt_off00010232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10232 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A49 10436 bytes
SHA-256: 5033937d000a1a7a31f159f0ff8d24c398aef76a6871efa7ca8acc387b1aa2e3

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