Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b936e11458d1161…

MALICIOUS

PDF

77.1 KB Created: 2021-09-02 02:05:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0770ae143b755c51d2c0bc02c2507f7a SHA-1: 2c7a2f049e81b2e2657806b89996bea096d93326 SHA-256: 3b936e11458d1161d3b7d277af774287281944dbf6deda2aacbbb8db5947415a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. These links likely serve to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=bible+cyst+hand PDF link annotation
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b038c797fd6---subenuwuwapitofom.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/8e8d3f3856787f4cccc11d5f4232bb12/madedutewezixugewevu.pdfIn PDF document text
    • https://4of100churchstreet.com/assets/media/files/98133342655.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/95410395890.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/94825391126.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/8670177994.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/mokes.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/m1aoqv2fb2us7kf7671uli6lv5/bagativolebowame.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c457f95b9c---12497308217.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/dobugub.pdfIn PDF document text
    • https://bold-iot.com/uploads//files/202108021056052191.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/vekotanerololadujenovi.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jusoto.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/58384aa76280eb4998143a0223aa901f/devitivojoti.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/xisisutelofaw.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43b5fcf44a---likegewilogenuluvebugada.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/14159771629.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071944723f02---80999107309.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/1392665955.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/5e8760a14850bcdba9c6f9e3e21d00ee/15210005504.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/52020512979.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01038b1d29---26451101143.pdfIn PDF document text
    • https://keongracun.org/contents//files/66693088180.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/62607763936.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/32748574385.pdfIn PDF document text
    • 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_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 16360 bytes
SHA-256: db4fc49c253be9e638304911aafc6419674898a4fc2d7abafb387a15c3c5b9e0
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 10552 bytes
SHA-256: 88351cd88064c8feb80076a796b66debafea250d9f7422c2bf56bf5400ee3c4b
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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