Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c245db0a3cacf1a…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 18:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e65738210aa4b720683fca6382ff6cbe SHA-1: 2435fe93803750f3b04e03859e70c95c4f68edf7 SHA-256: 8c245db0a3cacf1a01d1d825fdaa8e472bd31b5e702bd95b5007c3a005c67cdd
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=tx3+mini+bluetooth+not+working PDF link annotation
    • http://yule-sign.com/upload/editor/file/20210906074454.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/69258141170.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/befefapagubizoxepoxu.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/46638999988.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/72236419318.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1fb23cd0a---46848140287.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363749f1834---putasulamaxeduvijeb.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/tawadixapozolib.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/47473211122.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/13720482619.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/powedomadejokuvazoke.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/3eaa3a79e34ea4d2e3f8d41239e86b63/widejepenifapoti.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/14077289732.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/kovigixuvake.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/8003652127.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/49198199830.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/nexuso.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/65277277966.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/rolebatiniku.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bufigulafetipex.pdfIn PDF document text
    • http://badgerhillfarm.uk/64515832099.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/18920363078.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/24838875225.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/8776361972.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/57948993112.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_off0000e10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 18736 bytes
SHA-256: f3a0d8eb376aaa68c2746514ac8b8e90f74fc420816aff35dd30f562e0952fa3
font_02_sfnt_off00012a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A57 10880 bytes
SHA-256: 53c57ac9d700c994aa5e7fcb772f7580aaab74ed51406a7094bc61da7619acdf

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