Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad747684a9b8899…

MALICIOUS

PDF

91.0 KB Created: 2021-09-03 21:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0dd324891a27dee682778743d51afaf4 SHA-1: 6784b1baa012167a8a6007cc83f7d4ddc31f28dd SHA-256: 6ad747684a9b88996248a0088a3d992e525e8027574dd8bea6a6a8d6c12aa9b4
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to websites hosted on compromised Content Management Systems (CMS) or utilize disposable hosting, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://nocnepal.org.np/ckfinder/userfiles/files/tokidabakunizoxalozuxof.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b092e88c310---50063792762.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f6324de71a74bd73f980ad25cb03a459/98919107625.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/wewixogijavokeb.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b515e668c---32084150154.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1604894297610fe28bc37c1.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210705205917.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/fusegutisalefu.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/sokasezaz.pdfIn PDF document text
    • http://wwstationery.com/files/file/54076420197.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/elhlcfnspnjc20esbcl2dcc6d5/13152976185.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b91ceb96ec---neliwuf.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/52652864094.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826e65ce736---wuberujexivuwajukadaf.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nc641genml6ka2jl71b086j43v/69436784590.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/munaketoxemisegivajewesu.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093dd6fa30f2---68531047613.pdfIn PDF document text
    • http://preiss.at/upload_files/files/6072611627.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/71564224652.pdfIn PDF document text
    • http://from.ua/upload/articles/2021/06/16/files/nebugodapazij.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/86699126347.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/2364343042.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c8debf39---23428096143.pdfIn PDF document text
    • http://net-marketing.hu/images/files/32544220754.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/hn5tee64cumbe2q9klcsh0n5p1/73568228884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=online+pdf+compress+up+to+1mbPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 10936 bytes
SHA-256: 60f2fcb93298c978ea15df94ca0bff08561e6ab9d70444b899348e9b07697314
font_01_sfnt_off0000fecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFECD 17356 bytes
SHA-256: 3e6c5d761bdf82d8bbee16b4cd1c09ed23f67eadba6d461f54df3bc711eff987
font_02_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 17340 bytes
SHA-256: b6d4c2d2d11ccafb7c8f0749f88e3a7cacf246280b603a87d73de2d664529250
font_03_sfnt_off00014570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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