Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eaabc794ef2b65d…

MALICIOUS

PDF

115.9 KB Created: 2021-09-18 08:20:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1483252667672277d886834d79e9ed68 SHA-1: e35fc50a52e90e9e98b04a5ab05508ad3b9d36e8 SHA-256: 6eaabc794ef2b65d2a0a5b691868f5e7aa63850bde7c0ce01cb37aecf76a12b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable, but the presence of numerous links to potentially malicious PDFs and the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://glassick.com/userfiles/file/42603426500.pdf In PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/70597156832.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/repezibeki.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/kemobiriwidetokulanunu.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/85485160024.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6b94de6c5a768f57ca685b4f3eb575e2/sozibazakorap.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/59739417229.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613516848b576---9539352091.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/93509180644.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161306bb503147---46637527262.pdfIn PDF document text
    • http://inphilong.com/upload/files/noxelusifovijajegeseke.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/wetarolad.pdfIn PDF document text
    • http://ohdiabo.net/images/ckeditor/files/niwububorososevunobodorof.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/61750492585.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/14648563464.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b17b2a9b2e---bilujasi.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/9530197999.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131339328009---febikadukifomakuvot.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/gunowos.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/xepegesel.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/16688582462.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/27281926026.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/20439313207.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/litajifasokepavavowuwej.pdfIn PDF document text
    • http://aweibel.com/Photo/file/94581290927.pdfIn PDF document text
    • https://medtek.vn/storage/file/24000909168.pdfIn PDF document text
    • http://newo.ru/files/files/89932349532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=mlbb+free+download+apkPDF 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_off00015e8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001769f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769F 19572 bytes
SHA-256: 445dc25967f45f149f0df05010ba51d9ad4dc9cae026350730be186d3027a233
font_02_sfnt_off0001a9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9C2 10444 bytes
SHA-256: 69458664a7303cee12360fb930d5ca27d56a32e542bf44ec948a1f4c9deb3811