Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23532c1a75903ab…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 09:28:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 85c452ed95f70920ac7a2496cc73b63e SHA-1: e930c41127b9ebe45157e5c2c94589c7eeadd587 SHA-256: e23532c1a75903ab2a72a57fcc521994d6d6cd29c74458e24b1d7ddec6c2352e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=war+2019+movie+watch+online PDF link annotation
    • http://bhhangkhong.com/upload/images/files/84064943421.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/5165747185.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109060223514879.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/86066677234.pdfIn PDF document text
    • http://cosmik-kinoteatr.ru/sadm_files/wiledexakevo.pdfIn PDF document text
    • https://stoneappeal.in/FCKeditor/file/pokes.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a25387e1c0---fidolofaxeji.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/83492105885.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/13689808850.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/tufoxekuganejemado.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/73783492208.pdfIn PDF document text
    • http://hkacca.com/userfiles/dasat.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ehq7pc7p7u0nn436aavbu8sm6c/bomeragi.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/26233359866.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/jewawakofapala.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/112150062985.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/19394491142.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/60717026666.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/nomezanuvofigojetujiwen.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/jejexowabodudufijawuzaz.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/61605139415.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be7306851b---56914387565.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/muxebobofozuxiz.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/98067074001.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/99592045525.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_off0000dcb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 19564 bytes
SHA-256: 417d0a6bcaae6acd3712940a896f96bdf043097c6163b5ebc91219974eb15005
font_02_sfnt_off000128d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D4 10936 bytes
SHA-256: 41ad6300c65e02cba3050e18ae865b522875eceafcda97d6e93fe5ab0c661660