Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb155b01184ed9c5…

MALICIOUS

PDF

86.8 KB Created: 2021-08-12 03:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9e2468a1eabdc93aff31324e1cc4baca SHA-1: 7e23c6bdffffc21b2c685c5cc48cb060b3f46539 SHA-256: eb155b01184ed9c5cd2bc0870115a69a057b2d295f8398af2a2ae31245bf6d21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL targets suggest a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://hospvetcentral.pt/site/upload/file/xepixikogizedijewomevo.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/iclvhbd0shb86a99amkndk22r3/40299528288.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/tavazamake.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021072712545431.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/98304904461.pdfIn PDF document text
    • http://mtjjt.com/2013/upload/article/files/210724050238800988svxfm.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/58100160581.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d27766ef587---96917242877.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/fepebutixaxirofu.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/13142219152.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2bedccb252dccd84b2ae689a8d0edf63/59452766140.pdfIn PDF document text
    • http://allycatering.com/userfiles/sebezugopizani.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/kilavajanojetux.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c54633d4bd7---nenedovoteva.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16085e3d3c43df---40152075315.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c13ea4723585b0e24bdcdc31edc7a5ed/buguniwarexetapex.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe04184e64---52500438939.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/96408640200.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/97161752080.pdfIn PDF document text
    • http://emeraldoutback.com/clients/f/f6/f61299a274fa8fdb0c00f5b1ed511d42/File/35068971147.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/vipudexivoteb.pdfIn PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/sevunu.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/koxapufagusoronetuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=convergent+and+divergent+thinking+exercisesPDF 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_off0000ef4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4B 10896 bytes
SHA-256: 37ce999063f07169a8a7bfa51036c311b2fefe1f9bc8db92f42e195751229008
font_01_sfnt_off0001085e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1085E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12070 17020 bytes
SHA-256: 64ed045c75bf692d258f78a8e7074772f28093d93f8cf44f572f04ae408fe550

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