Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc6a1f9113bf2a1…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 06:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 282933502849eb92e4fbc0aa38b17b10 SHA-1: 0e12f49e44d8c699793a4ef77be68d2f3d3e3444 SHA-256: 4fc6a1f9113bf2a1f3b84c1236277c7ca70fa6ed797ec9d00127b37ea24f4f1a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised CMS upload directories. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The primary function appears to be directing users to potentially malicious or compromised websites through a collection of embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c47519b82---tedefid.pdf In PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/jolifupimuzusepesineza.pdfIn PDF document text
    • https://value.ae/userfiles/file/96622168131.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/92744256013.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/wifaremuzifewifo.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161352a9ee6c3d---zoxem.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/67423410103.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/15087875335.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132986631675---84918051652.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/36527370697.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/10556751894.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/8599009018.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/libotedafapujav.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/75795861658.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/57229790412.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/bc9595bb06935f8f32739fc19d93e1a8/dezivi.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/97647034541.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a0202373---kamixevaxu.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/govulumuxopubafes.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/92109931276.pdfIn PDF document text
    • https://innotek.vn/uploads/news_file/66749556063.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16133dbad53d17---girilomawatozijujino.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/6340300795.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec7d06303e---vibugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=tradewinds+2+android+apkPDF 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_off0000cd48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD48 21220 bytes
SHA-256: 2f3f1825eb2cffa36daf1cfa0c0d888fb8f954c523f5eaec5aa22efbafc8cfed
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF1 10500 bytes
SHA-256: 9c2f79c7bf2d1bbf2546b8b944cdcb88f2cfedbba191dc3218c2e0698c7f973c

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