Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf26317dac144370…

MALICIOUS

PDF

97.3 KB Created: 2021-10-15 10:09:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bb7e6e9e2e30d22ca0e3aea05cd9c16c SHA-1: 5c96b02b552f7a6b4896f8fa1dbd2475bbd091ec SHA-256: cf26317dac14437014333945753ecd06a3bba4e8be1fb2ea437d31d494f9ec68
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for phishing or malware distribution. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary function appears to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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 https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/314f50fcefd4f7c634d118ee2c452fee/jipoxese.pdf In PDF document text
    • https://0922.sproname.com/files/userfiles/files/sobatefaru.pdfIn PDF document text
    • http://www.perlodrink.com/documents/wuwuwikuzuvijuritu.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/15406460563.pdfIn PDF document text
    • https://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/litavabuboguseli.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/xubezijur.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/35456364241.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/fudusuvi.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/wowaronama.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/dezowolotofanasa.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16162b24bd47b2---91535257086.pdfIn PDF document text
    • http://sbkf.org/files/files/wudadijegizukudur.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/timunaso.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/dixitoretiguwiba.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160579148b71---70282720491.pdfIn PDF document text
    • http://dury114.com/userData/ebizro_board/file/21384962731.pdfIn PDF document text
    • https://pcetravel.com/files/file/43468726965.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xunimamakuvegaj.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/11050264168.pdfIn PDF document text
    • http://alltechsro.cz/files/dimex.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1616536f244fac---69111941163.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/11430299638.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a68225e8d8---41689427809.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/rezusel.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/49917525381.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/luginomozagukumejepanil.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134004c5bf37---judapumavafovigivitola.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161591ef38b288---jimerifefogenob.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=classic+wow+rogue+pre+bisPDF 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_off00011408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11408 10704 bytes
SHA-256: f9c2bb3b719611e6a9e9376c787896ba27d55c1e7d10d6f247a0a74348c4bef8
font_01_sfnt_off00012c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AA 19728 bytes
SHA-256: 721a7eb58a2994133b3f9f308e2bf4780076fd4bfddbb568224e4be25c89221c