Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf3d80eb6a1a9756…

MALICIOUS

PDF

72.1 KB Created: 2021-09-27 12:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cf80a43d8129d07e7efcfe3e63b6f449 SHA-1: 21da9870174551de816fe3a1930e2f25cf498ef4 SHA-256: bf3d80eb6a1a975697e92fbc89953a75993f16f2fb36163fcd21e169324177cf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised CMS upload directories, indicating an attempt to host and distribute malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of a link farm on disposable hosting further supports this. The embedded JavaScript is likely used to facilitate the download or execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161470d1ab15e1---sezinagegixunito.pdf In PDF document text
    • https://krygina40.ru/UserFiles/File/kulor.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/lunebigetufivizire.pdfIn PDF document text
    • http://opersan.com/file/lilosekigegif.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/89678442652.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/moxobani.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/vomesew.pdfIn PDF document text
    • http://standdominica.org/files/files/suxir.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/6305693096.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/93ee0ab1d87bd3e647052675802c9fa9/72292641082.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/tiponejovuzipukuboru.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/resevuzulapiduxel.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/wuxavawofujalijubafok.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/82763565255.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdea94dfa3---63389238040.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109091613419463.pdfIn PDF document text
    • http://renknh.com/ckupload/files/getusefixexavoluzimexulip.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/24394180534.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2885c2d1228010133595d5e9ed82b796/31186812213.pdfIn PDF document text
    • https://bawauang.com/contents/files/lizelowanozojovurepoxegop.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/pozid.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471b91f0f9d---79358142407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bubble+witch+saga+2+download+for+pcPDF 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_off0000b460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 16972 bytes
SHA-256: f167eb76b3edfec6322a01db8678ea2a517a8a3a14ea78311b6275b07b1c5f0e
font_02_sfnt_off0000f81e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81E 11400 bytes
SHA-256: 1c67f0d74ec4806b395d37b231ca08f1510a79ed3c18e5d70a9d3c61ab74e498

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