Malicious PDF — malware analysis report

Static analysis result for SHA-256 de96e096d6d89793…

MALICIOUS

PDF

95.0 KB Created: 2021-09-07 04:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 937f25933b19b367d0d3de802359a409 SHA-1: 7932fdff3d0c889d7b52a13ccc6e2049f1d28d23 SHA-256: de96e096d6d897939c484747e4b493fe104869761538ad63325c5806004392c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The file likely serves as a link farm to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=electromagnetic+spectrum+table+pdf PDF link annotation
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/ub1o0g4986dpdc8dr4sm6ji5q9/32314781966.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e9025260c700d22ffed7396d45e82f6f/94661651904.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/22808364124.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/76441466072.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607585bddfdf8---93157543561.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/50068094240.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/011a24e0809ebbf125597ebad5d64dd5/kimaxoboxemamifafabi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7599db4f3f---minarufuratuxizoxajoboj.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/889041632.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/pizujikolakuserebexaku.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/zumazesaboduke.pdfIn PDF document text
    • http://hargrovefamilyreunions.com/clients/16272/File/muderazenavas.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/b422fa52345828fc8cf8603abaad633a/vetijijedigepusivi.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/95385364282.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab721291fe1---vesoxaxubanobo.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/6ec61028b9852d0ada55cd358c705f9a/13067704323.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/93b60e981855fbaeb64c3a36d0aa59d4/vujaladuzuleguxaraw.pdfIn PDF document text
    • http://hhsmelt.com/upload/files/46802264290.pdfIn PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/fupadizapi.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/94672131286.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a3366b7da---pilagejona.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/juzof.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f555a22519---zixafurozunavunimuxakiju.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088052408ed9---47244028756.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/64842587659.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_off00010a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A91 11188 bytes
SHA-256: 994bfd7a90c2cfdac49a88c11d211e097661bafd21e90f3d3ac0cab0147df346
font_01_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 18872 bytes
SHA-256: 9e0ced33d3b7a77e4b2b92a634c7a806fbc5acc936a246d62c888432fc2df9eb
font_02_sfnt_off000155b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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