Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa32ac6e093d766…

MALICIOUS

PDF

97.7 KB Created: 2021-07-03 07:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 31003e80e9ab690a8e985e42b52414cd SHA-1: eef5288fef4129b803ff0bb9871bb41812a8943d SHA-256: 1aa32ac6e093d7660213dce7f0f89837a21727ab4acd284ffc0e17f5cb8447f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or conduct phishing attacks. The presence of multiple links to compromised WordPress sites reinforces this assessment.

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 https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/1vq6fcd2h197s2940ubvjeocb7/fefiguta.pdf In PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bcac8bd2b---galilus.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/ad63301edcec8adf05c526c1917cfc6e/77012960147.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093e77ecdcaa---bekanidexawomuf.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b612bc66442---9384087064.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/51703276452.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/figenunerobapedejisavap.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/xefuzil.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/9aabd20cfa9602cabab98756f413be5f/53720992478.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/8a4c3815ce10aada329750387e85f84e/vimozoxolabivutorokijip.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc6e2982ac---10391144635.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c93279358---dafenatutumuk.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/lakebeximotoloke.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/tovububagimelelekopuvabe.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608558e87060d---13735799902.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608be0bcb437b---2623004669.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/l72nc5f9cn7v4ui6ec1kfl3uad/68647586851.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210507063314170.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/9n71u0hdht7gr1eiia94ae7gs2/burudopesaxe.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/fubakoxibolurikomuz.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/wujebizobir.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a88f2c98a3bf7e1c6c4ee47da9985122/kozibifuluxokexovoke.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jgf29soq3kr7a078nb7300t8kv/78506784310.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/delexuwubabor.pdfIn PDF document text
    • https://optimustelecoms.com/ckfinder/userfiles/files/vafozuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+clean+a+9mm+pistolPDF 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_off000118aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AA 17840 bytes
SHA-256: aeb926c55cf99d3b8031f3333e7255f7e062b0ca622b7ad1967811b3eb35f4aa
font_01_sfnt_off000147ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147BA 10680 bytes
SHA-256: 68f7d80c1ad04d4e46cd40a0831990f336825578d6f0218c53bddee72de06b91
font_02_sfnt_off0001603c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1603C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1