Malicious PDF — malware analysis report

Static analysis result for SHA-256 84432cb78b0dd826…

MALICIOUS

PDF

88.6 KB Created: 2021-06-28 19:12:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 74c34e2dec946cbc4b645c064913aee6 SHA-1: b02728483dab85971a5c22d23ac7ec09f157a539 SHA-256: 84432cb78b0dd82664d2da1e3dfd1b08d9fc2b7fa15cd8f3407b92fccc46c48b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://cga82.com/admin/File/97183564144.pdf In PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/42203163901.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/xeninosogokaxemu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18eb7f102---65443548099.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/lcg3dmtk7ci8cdrvqrth000qcs/45588789538.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7309b83f---70365812909.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c289bf589da81cb182c1828218efafed/lobetosoxizapinexo.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4e57e3b63b1381b2d9b51b9dcaaf3002/66914601929.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xavola.pdfIn PDF document text
    • http://simonide.org/userfiles/file/vamevibediguj.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b6604fd46---58208598252.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/mt23u51r4vcqp9gvpsaef6dn70/2628310150.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ae20c258b27110e70eeac7448a38556d/sexesemu.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/pawapigitek.pdfIn PDF document text
    • http://mutitar.com/user_img/files/gabomexexeloxoju.pdfIn PDF document text
    • https://birotex.rs/images/files/kufukogagujozum.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/rmnk5tgpgmn7brel2qmp1o79me/54960381427.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/96948996294.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/0ff72ba43c6cd575d29e03d7c9779061/46012857151.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e6260cf2b---gefutefixiwama.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ad27ef953d8942a1f2c72b09b93f24a0/38170759744.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/vanukekonafemuzarib.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251f239274---46668271053.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/53055589840.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/43345299580.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=friends+cuddle+and+rollPDF 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_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 17456 bytes
SHA-256: 3f45a3e778a7a1fb97236398da8a9fc822e975a84e109521b01d9526b80893ae
font_01_sfnt_off00012582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D99 10344 bytes
SHA-256: 2321c29a254802568f9bc987d45fcf15b6ebfe6b722a904aec217bac287171b9