Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf98b31ca90accfd…

MALICIOUS

PDF

93.3 KB Created: 2021-08-09 19:49:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ed4512ebaeefe8202bb1ccbc88283bd SHA-1: 11f3bc9e9eaecac4d0215ce1d656d40e2870138b SHA-256: bf98b31ca90accfd23ed7f099ebe6c1da0de3a0045f31e981f784501bbaf2aed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://zulassungsservice4you.de/bilder/file/gowenigaza.pdf In PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/35765329241.pdfIn PDF document text
    • http://noithatsah.com/webroot/img/files/64504379364.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/2cda198795288d8c9931a343534d5a60/13496918986.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607145ab66efe---suteragepebinukumujidi.pdfIn PDF document text
    • http://gachbinhduong.com/upload/file/pokojuvisotanife.pdfIn PDF document text
    • https://unosms.us/userfiles/file/mivilowuv.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/bexibexeva.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/josegiwosamoti.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/74441813553.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/15957488300.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/gosiwajaveginumefidoris.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/d261fdb988bddcade2f8b95414c96d05/xezedexinupaj.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/lisavobotura.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/silopudisudalamizifo.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/pamemikapabosamewebuvixor.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/95784522570.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef38769b1d---10385816705.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16077c10967dc9---pazugamejipire.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/zodomuxe.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d991503b0---jigizedoduguwuvetobaz.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098af8fc7406---pumajekudefamabunuboxo.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607c57eabd759---44639977341.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8e04f01f68634e08fcba4df614aeedf7/xoxomojelobikumugobosele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=ver+pelicula+la+piel+que+habito+completa+en+espa%C3%B1ol+youtubePDF 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
font_00_sfnt_off0000e8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AB 11312 bytes
SHA-256: 8be0a312fbcdab356ed2c46d3a4c4a286103216060de4b89b873e64d522ee2be
font_01_sfnt_off0001029f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029F 18980 bytes
SHA-256: 2784b045b573f24630c843790257f6ae463183f22c25aae5fb25f898f1bb7862
font_02_sfnt_off00013389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13389 16908 bytes
SHA-256: e90b6d93debcb786b96d8eddc8b5c1c5044a7bdbae949db174bef3f8e546a9ee
font_03_sfnt_off00014bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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