Malicious PDF — malware analysis report

Static analysis result for SHA-256 90271ea59c2841ac…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 06:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a694383e40432908a354890f209c398b SHA-1: ee8475f9603d65d6cfa9181377146e9a33b1a4ec SHA-256: 90271ea59c2841ac7b0b14e3db76fbc4d87be084ea7ec55a20c6693eab1fc679
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of JavaScript actions and numerous links to compromised WordPress upload directories suggests the document is designed to lure users to malicious sites or download further payloads. The primary attack vector is likely spearphishing, with the PDF acting as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/kej81i5crskbr8ugl03sb1roki/sovesosabebupilip.pdf In PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/kilemi.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/wagodusutomupenadadezave.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/68700762322.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/d1be16d797ee01456fb658f3ed73d8ba/jajemope.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/67923969438.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/kotivoraxoze.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/74827409976.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/fogofumemedemu.pdfIn PDF document text
    • https://tessuno.com/upload/files/60d8f2d6ed0d9.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/tofar.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/73185881038.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e585580c0---463275392.pdfIn PDF document text
    • http://giteduguedesboires.fr/userfiles/file/pizoxirirutumiwelo.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/gewonozo.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/41869334769.pdfIn PDF document text
    • http://karcannakliyat.com/userfiles/file/kawudevejelisipirunu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcd5c9af3c---gidurabufovukajugejuxe.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/map6ak837sanvjr5r88eqck1p9/45095315333.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/xezevesujekomerakinazopo.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/471f97fc796c240d22822bf0a2ad0719/risororozatalevukovigiva.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/2ff0a2746c3ce6875252dbd4762e27d9/21648404044.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/foreka.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/12494802055.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a261c3e53c2---wetorulevegasogenefix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=code+optimization+pdfPDF 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_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 18368 bytes
SHA-256: 198fb98f03a9e65b8fad78b1a596aacc9ad1e0b999649674d5034e4ea57734db
font_01_sfnt_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F8 10436 bytes
SHA-256: e02f5204fd7c70562f46e32543a3342c65e76a3c4c6ffe949bbf7a9c6bdb7acd

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