Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f5c3513321bb00…

MALICIOUS

PDF

91.9 KB Created: 2021-09-18 02:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 389e8c61d99ed1013c2f4b5f32d0a00b SHA-1: b368655f9270bc240210cd422daafe3218d0b1ef SHA-256: 03f5c3513321bb00df552deddd59e7c95a80d51cd30265dd412a34bd0069e8c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to redirect users. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/96420180089.pdf In PDF document text
    • https://recapress.com/ckfinder/userfiles/files/93043394222.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/semivoniveridesimipaxiga.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7b998f5eb---72443731548.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/goxasugulo.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/63325566738.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/37198432800.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/vilun.pdfIn PDF document text
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/maroxot.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386d6b6698b---63930587643.pdfIn PDF document text
    • https://rotitelor.com/contents/files/zijezutozifiziletaje.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bcfd7394---41996721604.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/pevirikubuselikepow.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210911_025835.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/samuvutitegaforag.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/15336776271.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/6958567246.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/fopanogiworil.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613cceeb17bd8---jijaxojagot.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/98425490818.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/pozozuwimevenedofu.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/48376319227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=diagram+nonfiction+text+featuresPDF 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_off0001018b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018B 18416 bytes
SHA-256: 805f42eb79aeb591f2f342284437047729c3b65ad4603ce18c8ab058acfe5865
font_01_sfnt_off000130ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14904 10836 bytes
SHA-256: c93aa4b1f7ba554851a81d0b085cb028f4f877350d483d743be87899816252ec

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