Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4719cca0f0f70bb…

MALICIOUS

PDF

95.7 KB Created: 2021-07-06 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cc3e6e81ae19179c117d4ee72933e49d SHA-1: ba93c3644844e214f62cd2aafe46ac009afd51c9 SHA-256: e4719cca0f0f70bb3b487d74d23910da93cfbabb34188566966d60f37cbfbb0e
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

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 http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736f7674972---64194808507.pdf In PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5732a88b2e74be570a02334e2d8d46cf/valubogen.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5764bfcd1---17630909682.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbef91e0da---23781663958.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f3932036---26945209408.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/96522ca37039b26ab7c5372be9b539de/48741163920.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/kemoveratugevule.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082234b6402d---41019249859.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/fotuk.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/cfb0c1dfb36adf6f4f105e5527c51514/famojipemaxele.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/nisoxesemavikavolululino.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/13059760758.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/87779194134.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/149d0de4b688b2d800eea9a6a341df7c/86191467367.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/75799680463.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4563d172db---kizikanonuvexakakago.pdfIn PDF document text
    • http://abpaluso.com/upload/file/27747065640.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/xukuverunujepula.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210621_1D4834163AE60137.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/1486025731.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/pifutemujanikuxumivuxe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/n709tgeq3909i6jh8uo4k3q565/77504110001.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1cdbe035e---52254872290.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/l6fcllolk2e3ttqbc1lg8ok9q3/34462775065.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/vukexirop.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/qgei062nu98q3ihv1iijd144t2/41305210696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=5+sets+of+5+workoutPDF 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_off000114db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CED 17032 bytes
SHA-256: 0120e60e2ae7b68fff8f5a16f7c8fddac864e591cee349d375833cc5e5e80270
font_02_sfnt_off00015906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15906 10120 bytes
SHA-256: 5b9fcbb570ce75d5eaf649cce0118f1ab938d06f7cc446450323469ab38e20d3