Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1bf74461aa4dec8…

MALICIOUS

PDF

85.3 KB Created: 2021-09-22 22:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e0751935dfb315fd1a503d7ee10efb50 SHA-1: 64257131183c4f56cb349ae6a75e8486e67ee8b3 SHA-256: d1bf74461aa4dec8411d84e7a0c8eda139c7403a5950223b5c906c6a9596c4cf
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/022a0eb036e7da59d2948dabe3cb1b29/doseviwojipezi.pdf In PDF document text
    • https://gaadalagi.com/contents/files/48735341477.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/4777344353.pdfIn PDF document text
    • http://nppmaudaha.in/ckfinder/userfiles/files/madek.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/wozupezi.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/99962887800.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/64746483750.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/22309021639.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/mekigamefuxoloketube.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jisozerexivesevubaxu.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/34817025695.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/rabowokalabo.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/xowizenelixonimibebexul.pdfIn PDF document text
    • https://eastmanllc.com/ckfinder/userfiles/files/kajaderup.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/sutag.pdfIn PDF document text
    • http://specimport.by/files/files/7360301293.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/murudinu.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/18353628286.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/pezetufu.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613522d2ecf1e---37091928459.pdfIn PDF document text
    • http://zgkimsteszew.pl/img/upload/files/43044410923.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/tejevusopudegosimubo.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/23586772232.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/78452992847.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b841d3dbb---52146915098.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/samazativizemuguli.pdfIn PDF document text
    • http://orderkai.com/uploads/files/56359124364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=clipomatic+for+androidPDF 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_off0000eb49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB49 10512 bytes
SHA-256: f3274132055dca6b99d6589968c92ceb2cbaea4b96e980fc9779ba0b0d7213f1
font_01_sfnt_off00010322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 17296 bytes
SHA-256: 748673a6c8160041d757f29fec113fe9571ba88a1c303cba19d7de54758162f4

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