Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88f4225e11b87ce…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 10:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8736510c6a81f52960249944b83a861a SHA-1: 4dd891d855ab173daa1b63a059c5df273a49bc0d SHA-256: c88f4225e11b87ce16b2dbeaaade484db1e04d2f6c8f6d16dcb873ae531753a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. The presence of multiple external URIs, including those hosted on compromised CMS uploads and disposable hosting, suggests a link farm designed to redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

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.
  • 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 http://cambridgekapurthala.com/damana/userfiles/file/kodonenon.pdf In PDF document text
    • http://cosmic-kino.ru/sadm_files/pugugopasaveburegazulix.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd800b8ea53---rifeluwokituxubojopizi.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cb1fd26086c70a1ef1af1796cb6a087a/xakukowiregafexivavatev.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/wawaloxinowewu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7deb784ed---97471828750.pdfIn PDF document text
    • https://tomas-music.com/contents//files/sizej.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/95505440651.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/zusegaxajaxuxonemorifi.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783ca01615b---jowugovono.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/fddd383eee9eef31a55570fbb6dfd25c/xesalevisegaxurezo.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/fazofevox.pdfIn PDF document text
    • https://csn-alliance.com/data/files/sowubikexagexaguwu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16076264578760---wosobumo.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/daruv.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160944d4451466---gifasubesuvoburutemuxi.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/2336715505.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bb0f3efdf28d2c16a4f323ba10876210/wutinizunowigar.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/svfccl0qa1sstq0o0121ppcf32/kejulovoxizedof.pdfIn PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/22667426356.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbf8cecaa7---66005431818.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/xukoxesekel.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/solametapibifufirazigek.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/78055380351.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=christmas+carols+violin+piano+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_off0000e881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10093 18208 bytes
SHA-256: eda61c9793fa693a6f518c6f759baa995b1719b4bdfac5ed13609a4409a67ed2
font_02_sfnt_off00012fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC7 10852 bytes
SHA-256: 2f4a4f7ff626a6594a27fc1d31829fae106fedadec437e6957e87b1536599976

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