Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8f416801bbc5f66…

MALICIOUS

PDF

86.0 KB Created: 2021-07-15 20:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 89d3144d66489bb7221a2f06dd4cd6f2 SHA-1: 7f62c4ca0a778474791ac05beebf51c7ce784594 SHA-256: b8f416801bbc5f6677d149a9789e9e3c100b941c57291508459bc56ee44a9e22
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct textual clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/5470060392c42a64b0d2f2ea32d5c949/zofezekuxaw.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/wotewanumivozipetados.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdbbb57c63---25234358547.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/98778710086.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/vejanumiduratakazivijud.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/1eub0tlk3cj9u59i9vvrj878bp/13207172286.pdfIn PDF document text
    • https://12waktu.com/contents//files/jaberawuduxeva.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/6b768064ccefcbe7c5fb94eda6132a29/88187741918.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/daraginazusavedete.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d63d973e06---sikilanirekakejadum.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/10692391766.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d360208273f---rurolizaba.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/xuginofabiru.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/52077187871.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/4jcghuun8m5cfc2i0punv9mep6/voxigenene.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/letekodowikomogepibite.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e947b36a7---sefuzajikufimudo.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/bikutenefafelubis.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b8c4c10c---zegolovupidof.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a30bdf38dd3---magetavikugepuk.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/sobijapobafudak.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/6149288899.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/22904381525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=phonological+awareness+in+readingPDF 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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 10640 bytes
SHA-256: abb75d012efac265cfd279391615f1f24ee568d7d4bee3d36884ae160dc6f221
font_02_sfnt_off00011dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBB 17272 bytes
SHA-256: fbd3d640648af8d8028393ccfc4088c6541ea01a2816127fef8e83db2bbf57b5

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