Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b04acd3fc82e72…

MALICIOUS

PDF

74.5 KB Created: 2021-09-23 01:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 76c3feabd44a799197f5410488d275a7 SHA-1: c3d8fe15af66d29ec10e55cbc507e895e06c10a4 SHA-256: 92b04acd3fc82e726ef7eb298dc0ad9e8939ed93bec01c585a48757c8af676ae
156 Risk Score

Malware Insights

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

The file was detected as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The document body was unreadable, but the presence of numerous external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chowdhurytourism.com/ckfinder/userfiles/files/derekipotowemoribepevu.pdf In PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/zawuram.pdfIn PDF document text
    • https://qatarsecurityservices.com/public_html/userfiles/file/tugivekose.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/soruzujewap.pdfIn PDF document text
    • http://chieucoingason.vn/files/37612825376.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/55009635634.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210905024838.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/soximumivovumapiguvorur.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/lepesakeb.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/28412041749.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1d2543a5---34156724679.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/77bf47afa0e5c52b1b26235e49e35edb/86154183948.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/xumijitutolekob.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/16397434533.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/fopidamipiz.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/jokosapegerukifugireg.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/32656459632.pdfIn PDF document text
    • https://mimpiindahsatu.com/contents/files/20674722171.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vutikiban.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/maxuwa.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/59362565540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=52+max+level+shadow+fight+2PDF 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_off0000be1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1C 11008 bytes
SHA-256: a60dd146d2600daad9938afaa2c045e9d043713b4a140bd1dc2d1bc3aca49c66
font_01_sfnt_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 17396 bytes
SHA-256: 5ca3354c4cd53aa56f6fd45cbb6e5bad10d15cabd393a332c92b99b0d3df66c7
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1