Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca3d99a2ec75721…

MALICIOUS

PDF

72.0 KB Created: 2021-09-27 03:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f62f39a8dd2ad8b84e2e62ac241590c1 SHA-1: bb1e19f6131fddcc0ad0a7a09be3e5e20b8730aa SHA-256: dca3d99a2ec7572184f32a0cae812537d58960505f5afb8a2c0afae68f9a389d
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised websites. The document body is unreadable, but the presence of numerous links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://insights3.com/wp-content/plugins/super-forms/uploads/php/files/a604845f12422745039f37914c0a0661/50742320607.pdf In PDF document text
    • http://uceng.net/_UploadFile/Images/file/39094325093.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/25575865556.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/fibatimudinom.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/torejiremuwediku.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/7344446261.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/72609882570.pdfIn PDF document text
    • https://wittnebel.dk/file/14929551116.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/15312073518.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/duranijivujiwiveximoz.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/20750926580.pdfIn PDF document text
    • https://777mto.com/contents/files/vijuxevumim.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/movep.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dupiwivudijolenalufefe.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/2t008o5p57u7ehsi5pp55eq7th/jetino.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/vilalekamozizoleto.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/47389964999.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/viroji.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/rimizimi.pdfIn PDF document text
    • http://slovoveri.org/userfiles/zojajerevo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614f9b1e3d888---jawarebegufososegago.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/pivunokejek.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/21431375042.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jokametotesefavofipopi.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/96785243319.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/dagaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=best+app+for+downloading+tv+seriesPDF 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_off0000b590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB590 10880 bytes
SHA-256: 2812840653188f6d1f928dd1e41f3ae64133c5d132ac57b05aeebd11108dd1dd
font_01_sfnt_off0000ceb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB4 17100 bytes
SHA-256: 148100a92e4c19731552b321728a4d990dd997e8ad244563f27e1b65bd5c5e1c
font_02_sfnt_off0000fa1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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