Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41dad8b95fddca8…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 23:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fed777ee21924eb3f0581d13f0f11c64 SHA-1: 3249d2105c156d35c904ea9ad7d9ed26b152cbed SHA-256: f41dad8b95fddca8ebe79b652cebed5dbfeed6c253c90e191265bab6ce745632
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 WordPress sites or disposable hosting, indicating a link farm designed to direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://garglob.ru/uplcv?utm_term=convert+hex+color+to+rgb+javascript PDF link annotation
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/jowiwojezavaxobanorozuwe.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/tenogibufo.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/0bicojta72o1fcs7g9idhq8p4v/mevulivamasatoxu.pdfIn PDF document text
    • https://atlantidegattico.it/file/67639086465.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/vesosusukarijikizagujaji.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/tugasax.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210922142553.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3ca1cf356000f5010420f6697c2ebc2c/53217556070.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210923162334.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/nowasobipopepe.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/pemufasevenum.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d23eb3960a---3986957942.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/bosisetozosixurapev.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/kadorigu.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/b0a4d605d5279298237778826352df1e/25123376911.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/70377659917.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/lesuf.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/nepodiwulonudinizoxigavak.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/pusevarox.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/92358959150.pdfIn PDF document text
    • http://ktai.lmg.jp/upload/file/52014778251.pdfIn PDF document text
    • https://bunianco.com/other_files/File/mudumataj.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/73079327334.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/27820423112.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210915_225536.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210912114740.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_off0000b0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FC 11124 bytes
SHA-256: 986dbf0fd0a66515bd13e0def3e6855afe3a7edd0c2e831a385da48e34ff4e58
font_01_sfnt_off0000cabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 15212 bytes
SHA-256: c37d21f12a63b7aae024fe6716edaf0ffdeaf6f6aff3bd7067fa176abcd6f49a