Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3efde4ca97b6b3…

MALICIOUS

PDF

83.4 KB Created: 2021-09-14 14:20:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 20179e84db8cafd8aec5bb78aa772830 SHA-1: 8830ee3d57c00a5e62dc2b582973e88569543725 SHA-256: ad3efde4ca97b6b3b1432e4db5c5a74ee2908d9f5db007bf50d968c3a1243172
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious content. The presence of external URIs and a 'download button' lure further supports a phishing or malware distribution 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://krisoc.ru/uplcv?utm_term=voice+changer+android+free+fire PDF link annotation
    • https://geya99.com/ckfinder/userfiles/files/88888426370.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210905003207.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134ecaaa1273---jukekobupaxebevalodib.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/puxisasupomusufabe.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/vafibemaxomerosobizaseke.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/81813624253.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/serul.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/62983627906.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/jolexilifag.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613faab0085f5---57964470398.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/11608079130.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613bee4c0ce34---36276088192.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/65921991030.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/jibawobaxati.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/21985176873.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/33653166381.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613271f51c020---mabafunadunelem.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/zabiredasipudeje.pdfIn PDF document text
    • https://eventaipei.com/upload/files/48777775530.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/kowikixesazebenepur.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/82649348283.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/14270125462.pdfIn PDF document text
    • https://panama4d.com/contents/files/dinegukosovol.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_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10412 bytes
SHA-256: 1f7314a12143c05484082134fdfd907612f90401c50fcb1d426f1818b56109eb
font_02_sfnt_off000112ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AE 17628 bytes
SHA-256: 4dacf603460ec7d976871adfc4e290d97a1f08f8c3e8f0743c1fe1f1da092af7

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