Malicious PDF — malware analysis report

Static analysis result for SHA-256 51487fd388deb3df…

MALICIOUS

PDF

93.1 KB Created: 2021-09-02 00:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d38d8261f1b6662a1b16c61642eab71b SHA-1: e43e84e8e152701ff22b8829afd781c11f404c0a SHA-256: 51487fd388deb3df5bba803d35c59c584c08454e0a69aca5b21623b6e6caeee4
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to potentially compromised websites and a deceptive download button, suggesting an attempt to trick users into downloading malicious content. The presence of embedded URLs and link farms points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ingmarcofaedi.com/userfiles/files/99449198787.pdf In PDF document text
    • http://worldnaturalfood.com/image/upload/File/88314573116.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/35095467700.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/6497314476.pdfIn PDF document text
    • http://studiolorenzino.eu/userfiles/files/36594274428.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/66761702509.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/ninuvire.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160909145a8b42---zamevamajisaken.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210806051444.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984818677c2---fuverubovejesujo.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f27958538aa---22337872337.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/levadewutosiwu.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44d97db994---xejuvulafataro.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/091952581218.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/741748651.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/nuxunifadexisenuluwu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pelilajorasakep.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16078c5a8b794c---fidijami.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/78a4mmvum1vuf7gd1v1kk9cd10/tejukonoko.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/rimunoxoridalizu.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/dkn4ob9t3ep2b32at64h4ag7e5/56778033425.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/15504633646.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/6520487712.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1cd84981---bebul.pdfIn PDF document text
    • http://eko-uklid.com/files/file/rofovifezasoturotew.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/00ca877c0b032c248bd29064ad3fa238/93229061735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=year+5+maths+worksheetsPDF 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_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 10428 bytes
SHA-256: fa4e9c46335a7900e7affe994d8ddac3835c4b9960e3dc1dc99094f4aa50a099
font_01_sfnt_off00011ffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13810 17828 bytes
SHA-256: 0f5d4c795b87bb1e13c7eae408d71d0ccdb5b084e7c6d1ffffb265a58b674742

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