Malicious PDF — malware analysis report

Static analysis result for SHA-256 745a3e1090ebee1b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 21:20:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2622c683f0f3ea30e9ca3e7f256093e8 SHA-1: 28757fc45c7f884877f767a874665b64f4529619 SHA-256: 745a3e1090ebee1b87ffa28f0aa7b8a7e7d410b1e380972d7cc5d92d93ed5320
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to obscure the final destination. The PDF structure and embedded URLs indicate a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://lagrupacio.cat/file/97484824350.pdf In PDF document text
    • http://wabasnb.com/files/fckeditor/file/28473040860f3e8187fb33.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/gorigexuzagoxavibixof.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/73888668677.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/a9c4a998b7892515d0a0e8ddf62fb16e/pebilitozudifogasodidi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7911cff98---976936202.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/27144665017.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/24005478921.pdfIn PDF document text
    • http://onestudent.dk/userfiles/file/legagafajiri.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ba463b0dff5b6d70a5ea7dc7009bc0a1/76820573258.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/savefifilaraj.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/sobowa.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f4ca0e97a---jugidugizabibevizipojuwa.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/12574791499.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/90635761869.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/79244757656.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/42655129361.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4b67c924---77500652330.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/89509919437.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8be010a95b---77087149907.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/10mtvd4b6vrq1ni947h41ljqe4/pewoxibutepezotenebakiwud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=picture+graph+worksheets+2nd+grade+pdfPDF 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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 11252 bytes
SHA-256: c25145dd524b9abdb4698c4f786818be9dafbad8d42a72b7dbbf672bb1885350
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 17136 bytes
SHA-256: 25ec53453fed4c0d2672e386f648645a4e205b332e7a58027a91ca2f023cdc4d
font_02_sfnt_off00011b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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