Malicious PDF — malware analysis report

Static analysis result for SHA-256 51a98740227e5404…

MALICIOUS

PDF

95.4 KB Created: 2021-08-13 03:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb4fc58973f5634f20f067a61678d112 SHA-1: 47e31ddcc19db1f716314daa757a456c1a344c57 SHA-256: 51a98740227e540425bb4b04312daa4431036bbf326e333b02178a734973f5d1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/fb0d2e7615f123bca35ba0975ae05a60/kajuzelija.pdf In PDF document text
    • https://workinhotel.com/upload/fckfile/tonejinepolitexazadebaris.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/486354420.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/12284983370.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/79a68a3ef277c1e9cd31c897c760d72f/38636996345.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pazilepegulikejubire.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/feriwazakafoziza.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088cd236754e---jojerutoruxezufegene.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/zabopotiwexudukuvifasevi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba35a4b291---dodevopuruvatikibuxom.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7c3bbd3415fe7ab096c3876c239fce4/lovonafawisevuneza.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/6b081ff2b1cf2ce22802edba9fbcd305/16509264058.pdfIn PDF document text
    • https://patriciobanados.cl/upload/file/In PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/fotowatugibukaxumogibikos.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/kadasawoseloxukefaso.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/gagesidesitodexasos.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/pibomanegodepop.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/1fc1f6c030805d393395fdff8084a71b/gevalapit.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/qadf3blt14t1nu9slmctvv65e5/guruxiwovamajusinunolajim.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/zuxedal.pdfIn PDF document text
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/91034818434.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1kkqvdvgup082b5sopu8ib1fe4/32654649267.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/aa0440e2d3a23024310830bfa27d7d9b/77403211765.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d825c2a04c---tuzedufanefibowuza.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/42159424113.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3898a59ae---kusupavaredor.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/tobexapanasagujozudikito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=how+to+identify+washburn+guitarPDF 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_off00010e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1A 17752 bytes
SHA-256: e74fd3b27d686f750c0d28e90cdf466f7e6c257940f0072e7fd2b85b37f7b45f
font_01_sfnt_off00013c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154B2 11016 bytes
SHA-256: aca14f6ba8bdec0035688910f2c8eb3aa518d97c392e07d3a477bd34298801e0

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