Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eb961cdefe30f4…

MALICIOUS

PDF

90.2 KB Created: 2021-06-27 13:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 012a7c9910a143202b24f241f5ae0e53 SHA-1: df9b10161dd57400f5c5fe93500d45fd048676e4 SHA-256: 33eb961cdefe30f4ae8f73538119940f380dd3986cc6728df091b6a0ff3e9b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://westernmaki.com/uploads/files/wusojikox.pdf In PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/44c5d97b39391616ea41c5e959fa9d3b/53212131576.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/d54884cba8a3be3ee0c5a50ab790bd57/besopipivefokoxenevilemu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cf7cb0d49---88830976886.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/buwelogiwirikeje.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/0c41b0c7f7561ab88258fbb31c6b4ec6/wejovozunezewoki.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/29ab095818ebb4bb0ee84a451292f27f/niromofepesipoguw.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/87790830294.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/db39ce1464ee21cd9fbeca4529685b7e/39957909146.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff03742c55---nupalipusedopetug.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b93d61dbbe---30697846847.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/buvopurirazafe.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa358e8bc---75972958234.pdfIn PDF document text
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/sasevopoxupum.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/bexamudemeluwezaf.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072bcb9afc03---14626649553.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/36149369481.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/zasukejerujugotifuraw.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c64ff4c096---bafosemaniba.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfaa94276---277100129.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/venedimosixedurezokesat.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/11416537513.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/56162838999.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c14705d7fa---xonigevab.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a126c59ce69---foloto.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c497d4c5ece---mezodetufalekose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=moles+to+look+out+forPDF 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_off0000ffc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC7 10036 bytes
SHA-256: 27d4d51591703282d322058145a8b849bf450e1da1d3abf66023dab474b1717f
font_01_sfnt_off0001164f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E61 17176 bytes
SHA-256: 7219a91114f297d4573a612bc9b18be2602b4037a59c6e65ec949c0b9b6dbb2a