Malicious PDF — malware analysis report

Static analysis result for SHA-256 9519d98eb82e1f9d…

MALICIOUS

PDF

93.8 KB Created: 2021-06-29 14:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8b592bc7d88e1b40dadd37d56bbdf6c4 SHA-1: 2227e7064f94c2150263cb145b7eab9b9b014a47 SHA-256: 9519d98eb82e1f9d9cdf3e3aa726a521b6d849a40d417452d1d4f26a0969e03b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a phishing or link farm attack pattern. The file's purpose appears to be directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://oniceh.ru/uplcv?utm_term=garageband+user+guide+for+iphone PDF link annotation
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608340b254d5a---6132746514.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d48e82296---30086297916.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/36523533c79951398386aa6d1347e2cf/17600909997.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/xoleberilidekajo.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/zujubiwubu.pdfIn PDF document text
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ad297e78---zuwinitifi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/90c0f742413a32ce1450ba5a712a5f08/5608258986.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/3eacb1e89254c153e268ebc142940917/dofefumuw.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/guvapedekepopidovalanaxed.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf03dd9576f---bokam.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/fawovaxarixikutufidodasif.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/weravalinuzotet.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/58142436873.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160997c7489257---83508450044.pdfIn PDF document text
    • http://midel.me/userfiles/file/54057876849.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e40f909fee---fozisabedavorawibazuto.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b18a00a275---46402148934.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e7f8a880372fc998c561f3e4e57fe01/mitarigibituzud.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a337b0c9a11---27107974487.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16099c950a4300---17268934165.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/mituzezuzunanopuluwu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844b0ad0144---gexomi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1b61b4c2c0387ade70ec6afd881ac142/13879399348.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/fugezupesu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/9f10799dcb4a30fea9ee92715891f8ac/35133217241.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/d9eb7f873c5fc4644e83c5c7ab5e7c0d/gebexobajozebugif.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_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 10912 bytes
SHA-256: 8a29f7766a4270ee674491e917fb2fccd54266ea835007614f846927d8851fe5
font_01_sfnt_off000124ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 17184 bytes
SHA-256: 6ffc38d0da9f563831eb12c9040503defde21d8909e2b6312c3f46668d27a171
font_02_sfnt_off000151d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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