Malicious PDF — malware analysis report

Static analysis result for SHA-256 60b0be77da5eb07f…

MALICIOUS

PDF

91.8 KB Created: 2021-09-17 06:20:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 437bbaa58d8735c5c15c046f8c62c076 SHA-1: 273e275de47bbbc5989f3983957348dbdeee234e SHA-256: 60b0be77da5eb07f52f78a3681247c7a23042d5de509c03529f3686e77bd4eac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://smidgel.ru/uplcv?utm_term=the+birds+of+prey+full+movie PDF link annotation
    • http://www.binghan.my/userfiles/file/jefedoko.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/975425449.pdfIn PDF document text
    • http://4226080.kad.tw/kads/ckfinder/userfiles/files/2476432401.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/xemivusojinugisemixefuji.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/lumepewobogopigumovanuwaj.pdfIn PDF document text
    • https://thietbigas.net/media/files/91964487654.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15c6667c1---xilurizazibod.pdfIn PDF document text
    • http://ingore.cn/upload/files/soxer.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/jiwinikajosoxuzokiku.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/76417809025.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/zixebetopadumonupedet.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ib7fia1h8cjon2g3o1gt3qjppu/fajuzumaguvesare.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/kuzabopazagolusenudoja.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/54573619715.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/lujorotugunaf.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614094fddb890---49996223685.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/tojol.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///86340256694.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/24387090280.pdfIn PDF document text
    • http://p-jtech.com/userData/board/file/86771938565.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/morolijijegizatu.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/54598808201.pdfIn PDF document text
    • https://toocapen.com/files/sonixajuwufozaniv.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/85726347582.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/kalugozaja.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/67320999037.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_off00010134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10134 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11946 18244 bytes
SHA-256: 5867d1b0faa48e1e4850906fa30009a5779be87711432ec96522eb19a2133ddd
font_02_sfnt_off00014907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14907 10784 bytes
SHA-256: 45be0d547246bb4dd65b7a425982cc0d9fc0aba9736451a5f6826910fc4e8aaf

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