Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f42fbc9e54243fd…

MALICIOUS

PDF

87.9 KB Created: 2021-07-24 07:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9e749e968d04072e9ef8095041904052 SHA-1: 4e646b40d36fc231b812a27ace0556b53d9c9a61 SHA-256: 5f42fbc9e54243fde9b907b36ab7903d34ad192104a30e9b9e1cbf8302ed8e92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8494262ad912a69d513b9a94c0a7e536/xizekojomujizusen.pdf In PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af21cd08474---17870110844.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/wojeleriwi.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/21969204372.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a98f40070---52680833160.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/deven.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/pimijodususoju.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/32387856594.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7cf573f1324f4555a44032f23a58193f/24649845250.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b412148f8---sizibolozibeb.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/58129957763.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/e4a72a067e712905e6bbf943456237d3/mozemaka.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de7964cf7ba---65572095352.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04fed99643---lamapig.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/47127289597.pdfIn PDF document text
    • http://phillipsbricksalumni.com/clients/56168/File/37206094423.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083699d2f143---lumizipebevadazebelaru.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a477efb15---86971835106.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/nevudipupunivipuxe.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/13705666093.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/o9jf4t0co7482pinn6g23ef934/61322784973.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/77138853023.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/44914868821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ultimate+car+driving+simulator+hack+mod+apk+unlimited+money+and+diamondPDF 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_off0000eed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED2 11340 bytes
SHA-256: 53b43d771925dcbd4e85e6417e3c2f54e22bca99b1b41b15848206ca442fbbbf
font_01_sfnt_off00010921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 17216 bytes
SHA-256: 7aa0a8d9948e66becb168080ce465c85bd22ebaca9dea974d190e459f8586b43
font_02_sfnt_off00013624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1