Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd21f8427dda213b…

MALICIOUS

PDF

83.2 KB Created: 2021-08-01 11:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 36ad5390ea6e418a84be16f6212bf0f9 SHA-1: 2261654ebfb001f9d2a2202c0b1aeedef67fbd29 SHA-256: fd21f8427dda213b51f67573eb71cf0d120e2101e61daf0e6ebe6bc90d5e3d59
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and heuristic firings indicate it is designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://alexandrapanayotou.com/web/images/static/file/52078141693.pdf In PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/5746290311.pdfIn PDF document text
    • https://posh.hr/files/43593833908.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/55482584085.pdfIn PDF document text
    • http://premium-h.info/files/files/dexevenasewobomafafodaven.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b951345f---fibadavalodetetovigar.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/boranasobatafef.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/b8eeb818209901b1527cf3840c5deb1a/84155372397.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/61148709960.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/dawegoxiwikalogipulag.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/129064861.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a80ebb93ee---bodepunanosas.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/62316049592.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/jiubi7okkb40idaud6e54tr5e5/73212986920.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608709bfed4dc---26391132274.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/68437271404.pdfIn PDF document text
    • https://mfdesign.hu/files/file/natewaganorelaridigupopux.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/wubidasa.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/25816969108.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/9a499fc54a5e8ffa76fc2d1a664da59d/88598747702.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rikubotinozuserupepotuz.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/1b4d9ab6d06f230883e44b7acf971e00/vovijaxofapatimatebosa.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160c564c26a883---todekobesuli.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/o2maaod78l8qekdm6l6sip7i1g/kerakezowido.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/88233974302.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/604605170aa22d8ead60244117706bca/66102416026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+song+jo+tu+mera+humdard+hai+female+versionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000e2ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE2ED 16836 bytes
SHA-256: 200686e5cae5a04270f0e543ac38f0a4209c9c90ee8b5ee67339f7c07bdbcddb
font_00_sfnt_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 11184 bytes
SHA-256: d4678b5ddf719870f670322f9633f98adaa368fd74c4a4a6c767edf8b2d01d7f
font_02_sfnt_off0000fade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000112f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 16456 bytes
SHA-256: 15b7e740a33b15aab3de4fac4596ab051c0e3d117f9ca84c47393a819f22409a