Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1760a6d70590cc…

MALICIOUS

PDF

75.1 KB Created: 2021-09-18 10:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 047a14b63bb5c5dfec3cb2eae8383707 SHA-1: e71324c29dd95fc902cee0e5d6d503073d2cd83f SHA-256: df1760a6d70590cc25d41025bbe150ccfefb7f056589fa9da56997cda30a9664
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm characteristics points towards a tactic of luring users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • 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.
  • 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://kawanmto.com/contents/files/29663203464.pdf In PDF document text
    • https://gadesign52.com/uploads/files/202109081434071083.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141dae22ec3b---24253461701.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/125ff0b344530ed8f1185643c87d4b74/ludazejoxu.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/7635233599.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/3342626648.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e4c4f64e---76880749506.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d65dc5e36---50488247835.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210903235801552.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/gefamuluxipawuzexozejetat.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/movalibuperudemajikib.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/18254320574.pdfIn PDF document text
    • http://18554080.com/userfiles/file/biwozodiz.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/vipivot.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/98128815993.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/kabixezilulazefi.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/bedilonofo.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18cad0ea3---jovolenejagowuzevositizi.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/nazixinuzavigasolelodu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613980c2c75c0---famebazilotiwopebumokuje.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/68032830015.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/totajig.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/26119389185.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/tumasadesotijoto.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/rozometupolize.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/zekagiligedobonivaluxune.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=damon+ps2+pro+crackedPDF 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_off0000c127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC127 17416 bytes
SHA-256: 55e8e0fbb3208315ce0ea365ee56e8f5f07e51f23cc5cd0747d73376b5dd2019
font_01_sfnt_off0000ee6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10684 10652 bytes
SHA-256: e392611130b9666568e39eaa3dd23b5d3cd9e65e8c342b34e906115e1f2bcfe1