Malicious PDF — malware analysis report

Static analysis result for SHA-256 09f56c11f54f1fdd…

MALICIOUS

PDF

83.9 KB Created: 2021-09-07 03:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f223d1340c2e23d60cb74c6ab6c15d9 SHA-1: eaa069f125a554c928f50a064f2eb97a7ef13d54 SHA-256: 09f56c11f54f1fddad006316284732e91f3719c5e2c30755c5274f81afa2996b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload is intended. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=basic+sentence+structure+english+grammar+pdf PDF link annotation
    • http://isspskola.lv/userfiles/files/71926450930.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/nezamarosilaziparajode.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/bogefutokurito.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210818_3BFC5D00828A18D1.pdfIn PDF document text
    • https://austarpharma.com/upload/files/76259986566.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/44691960155.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/vejazobedibotitudut.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/069fd5c254f94c96b4e0f7573fef2ccb/satavigof.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/eb45ddf7f2011297064757b3e33011b2/palikorava.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/95534881450.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607096ccc2b81---77540807435.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/67478189149.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/finisiwedo.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/5m6obfkv7ove2p8jmh5c9ph3j3/supirisisepexewesubikogo.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/24525139641.pdfIn PDF document text
    • http://agavietnam.com/img/files/54628202454.pdfIn PDF document text
    • http://insei.eu/userfiles/files/34122412510.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3262dbb1c84490bea5430789db1baa0/kuxupubalupuzekowupe.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/89076260193.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/58834598030.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/67879483692.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/qqde1lnmi5q0sdp8kh5r9cgh1g/vezosodunudekesum.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_off0000e1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A0 18356 bytes
SHA-256: 68cdac796f41b008a78b0669a52e781bc6e25a48e062cb33c5322539d6690ee6
font_01_sfnt_off00011088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001289f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289F 11100 bytes
SHA-256: b9b6e8b1accef1ac620cc53a137b9b45704a2d507521f4308b65c8e6954d0be0

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