Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abc6dc04a793d2a…

MALICIOUS

PDF

101.8 KB Created: 2021-07-26 00:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 990d813784e4a50ea43c621c4f8a4274 SHA-1: c21a683a39f0042dfe0e4232e6c8f4b5e418b154 SHA-256: 8abc6dc04a793d2a95f958d0cbe7f60af845e490ddb8ea12168e06fd46559024
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba30507dfe---maxifutububexun.pdf In PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/1921b50f02206c3456bd5a1f5f155287/48911788209.pdfIn PDF document text
    • http://lyshiying.com/d/files/22186653734.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/406270e9c0b88b428e9f059c95d9e816/62297063688.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c15d18b4204---jujebaxufunulipafituk.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/68067449537.pdfIn PDF document text
    • http://canvangdientu.com/images/file/fosalazamisejewusokowu.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5a27c1fce---8879973092.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/javopig.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609836f5093d4---laviwadupirirugenu.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/55766267555.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/58434519743.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/lafipuloruzilegokadewosir.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/1f36ba2af4043e6c957806feb747c7dc/repomerifi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c81c67317a---fixigixibokexekureka.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/676cdbf3198bdc6987679ad00239af84/97932923974.pdfIn PDF document text
    • http://splogservice.ru/content/file/tadozanufatixiduva.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e14ddf14bc217741688f42c42392c9f1/bavevebotojatawodu.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16070e9e431695---15696098535.pdfIn PDF document text
    • https://rcot.org/userfiles/file/71360215173.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e9574ddfd---tufaluxobuvubobesupajak.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/hb0fegaq21o1f14ad9ha32p1on/66545646702.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef727a5109---62636637541.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/bibizigula.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6d3c2801e---gunewixixifuxuluv.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/65a622fe84bb2c4f7af24e6648a02ff6/2425478486.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6898035bd9d93a5697d669644bea75db/zofejuzoxali.pdfIn PDF document text
    • https://signika.pl/Upload/file/72104857022.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+does+high+platelet+count+mean+in+a+childPDF 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_off00012a32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A32 17276 bytes
SHA-256: 04f356908a4ef5b0cf3d51a570f10a3a153c0b7d746b75560569763c28c733b0
font_01_sfnt_off000157c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FDA 10956 bytes
SHA-256: cc0320eb44e28b161494d1ce6dc96b0bc5f89ed5f08cedec001fbaf2c33619d0

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