Malicious PDF — malware analysis report

Static analysis result for SHA-256 c966ce2a17714673…

MALICIOUS

PDF

101.4 KB Created: 2021-09-04 07:59:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 844779c078a1d53f45d3577865208ad4 SHA-1: ba621f7e7d52bb5016cf2162d71011a654488fce SHA-256: c966ce2a17714673a8f11755d073bdf6c328175c92950f2da5477daed3d32709
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to direct users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://medvor.ru/uplcv?utm_term=time+magazine+modi+pdf PDF link annotation
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff62ca1bd11.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/juxolowejabimes.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/kadesoropuviwevalej.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/sudemilufa.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d094c7d314---kujebometan.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/43207422987.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/wafadidanivexefaj.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf49585af75---57502699908.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/rokukowexad.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748d7010e43---tisisufolupuburojeg.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nijupiwun.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160ad659336d93---dajusajabo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8d2a94a4db0ebee427609fd42b734b57/80751194647.pdfIn PDF document text
    • http://gsemilia.it/userfiles/files/40642162655.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/ifi3l2dnief1rmvq2mb9iin3ai/gozunik.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/33617338133.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607821c89a997---vinizadikasoluzujuletun.pdfIn PDF document text
    • https://mszukam.pl/dat//file/diwod.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/zizuforatibifafidoz.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/9d4aa5fb87e7befad60c419e1519fc32/wowet.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/jaxuv.pdfIn PDF document text
    • https://mbbs.hr/files/pemoxowabobeviga.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/30299458971.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/b5j1bag5qd2nev791sjorcse02/buzofa.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/2364768737.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_off000125be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 10452 bytes
SHA-256: 55bb4a71a08838b7278fb8e770440763db93be7bd8510ac2501fef0fe8c06e3c
font_02_sfnt_off0001554c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1554C 19820 bytes
SHA-256: 758b31757f32028eb3a72b138443592b6251bcf7e2cbb687c6ba1ffa27060549

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