Malicious PDF — malware analysis report

Static analysis result for SHA-256 de8aab91f8d60887…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 20:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ccec2e7880828cad9a6b8735c0e3d60 SHA-1: 635821c2195a5470b957e9c7de8374a0f3fdd141 SHA-256: de8aab91f8d608872db1bb36885c498322f26571cafe927fe3dfbea6bba16259
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it's part of a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://nomylo.ru/uplcv?utm_term=cities+skylines+infinite+money PDF link annotation
    • http://ndt-tl.ru/upload/file/biwojevuwotiwudesofaremo.pdfIn PDF document text
    • http://thaide.org/userfiles/file/xamope.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/potabufubepopetorisukemu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/45919f8e13cf6329160e1c0340c74507/8719534467.pdfIn PDF document text
    • https://digireg.ru/upload/toribimuwopagibi.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/70589451345.pdfIn PDF document text
    • https://southafricapools.com/contents/files/42078715913.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/54129054299.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/1c8dc4ee0b1139ce56c4cf380e78956b/91385467518.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132c545ba99d---6627819262.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/29128560823.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/9kput5776h3an5j6smvi4hs2v3/wawem.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/32500307799.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/fupuvusikanifigorufozo.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/60178742408.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/ramuzej.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/91070337294.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/49589254333.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/64172509427.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2490869ca80fe8db02a392f689e8afb1/20474970789.pdfIn PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/zewizodenilufowub.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/rudezaruminiwa.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/62344612759.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_off0000db0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0C 18244 bytes
SHA-256: d549d0f6a5bbc6a14d68527d32eb3218c068786c0bdc79aaffe6c8a3d520ece7
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FF 10352 bytes
SHA-256: 53bb4400cc006c8d1572a9e69ca67bf9cc8973ce1b151dbf5407f48702a26fcc

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