Malicious PDF — malware analysis report

Static analysis result for SHA-256 2645ad0bf692a195…

MALICIOUS

PDF

77.2 KB Created: 2021-07-21 19:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d1ac533e39cfc9c28f5b769fc31bd7f SHA-1: ca0040fa3af15745c63a497cc9dce8d8c7ed101c SHA-256: 2645ad0bf692a1950ca5fc6d49304a6a5c218c9388138cfac2782617c1285c28
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://netwindowvn.com/uploads/userfiles/file/kolezimodizupi.pdf In PDF document text
    • http://apexnepaltravel.com/userfiles/file/52323908768.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/utp7u4lkk8tt8deavdv97lki61/duzizenuvifow.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/pajazikujako.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/99738292427.pdfIn PDF document text
    • http://creativetechno.in/userfiles/file/kuweba.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82949cd8a2---89283069508.pdfIn PDF document text
    • https://pmms-online.com/assets/file/jorazopo.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/wadaxegizu.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/25343931700.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/0c5h5oa4hisps7gtivaui2o3hc/zasix.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6cvf73hu7498f4pr4rbctbotgg/bubefobepaduruguwujomu.pdfIn PDF document text
    • http://bjjiffy.com/upload/fiwitil.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/390ac50513de73e86f6d97f964865a6a/95380618058.pdfIn PDF document text
    • http://midel.me/userfiles/file/sajonenojevotomakulodata.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/70624803962.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/d3f34d0fe62891e4ca4fc4ae25d53c83/semowawajixezurovok.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/92e0f066edc020a1ab35855e14e18ee9/zusazibikabume.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/49715134153.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/busalelomer.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/90604170452.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kosisalujajetovajuw.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/77331139700.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7jr9mgdoj4ja8l850s3vah55c7/39927384906.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=the+kite+runner+study+guide+answersPDF 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_off0000cbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE0 10716 bytes
SHA-256: 2aaec5ddb001be11240a9e881f45db3603dcf0480f6924918ee4045c59936ac2
font_01_sfnt_off0000e451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE451 16400 bytes
SHA-256: 77fb0959f22ed0a7b0874c2558ebc188c39905dea5258932ba01d1edeecc561a
font_02_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1