Malicious PDF — malware analysis report

Static analysis result for SHA-256 c940c6b32b9f35d4…

MALICIOUS

PDF

84.1 KB Created: 2021-07-18 02:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0dc0951c946f30c02801105c2b192881 SHA-1: 159eb1019267328307ae8d790482432d761369b2 SHA-256: c940c6b32b9f35d46005301dcb758eeb2a1ab0196064556f42ce6fa0b5ed1916
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains, likely intended to redirect users to malicious content. The PDF structure and the presence of multiple links to potentially compromised CMS upload directories suggest an attempt to obscure the true destination and leverage existing vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a16c552de92---dexewilidez.pdf In PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491bb6d066---90448802748.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/tosuxemikudawuvorowun.pdfIn PDF document text
    • https://strechybenesov.cz/content/46821706029.pdfIn PDF document text
    • http://iccarrentals.com/files/file/datizodi.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/husdqoc7k22fdopvg0f7sud8ai/gilemijexevifu.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/49583022019.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210607184852909198275.pdfIn PDF document text
    • https://blugarden.eu/file/zagudilatezesulifufal.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/9175fb02f221221a48efde0a878cb2c4/kavonesewisizedipejavolop.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/55203081757.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/buxikiduwexanax.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a932774e89---ximenamusofew.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/re2t1mfq0ci220t6kfqdjcouqr/fogopojomagaminanor.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/865e3e157063a3b6f2af120ba8f0bcdc/sawelapejumexisojetipira.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bv57o70kbsivnhqa77o8f1crg2/pepazisulipuxarilino.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/806200659.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/eqf8qqasms2ccrbn3rj2pgfcoq/fuxobom.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/aee25be19b1acd210be2e587299bcce2/wowexogopureb.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/29537754154.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607811115fd68---38554555636.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9f586c13---lelut.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084dc29c422c---nogufiredasuduvalurojudix.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/xivadavukivanoreterabo.pdfIn PDF document text
    • http://altinay-law.com/images/file/vutajuvolikutorizij.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/dc5b06f04002b48752b8dbdbcabb3f81/66694465033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=stratified+in+statisticsPDF 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_off0000e52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52B 10376 bytes
SHA-256: e62c3e16726a3ffe7d89b89838e71f09c4ef19a983bad750c3d1ef364deeba4e
font_01_sfnt_off0000fcbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBB 17652 bytes
SHA-256: 654d5beba8b368cc12ab6afafca6cfa32e0ac5306485c8cc38ed17f2af334b9b
font_02_sfnt_off00012b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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