Malicious PDF — malware analysis report

Static analysis result for SHA-256 eacfd0ef152f65bf…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 03:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: da1a2d4cc3b5b282b4bc17485f204278 SHA-1: f1347073500a463dfff249bf8987a1c9fca9cc30 SHA-256: eacfd0ef152f65bf1a916f8ca29a75d36530cbe3ff010f6cc19a91fab7a34d98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=mode+of+nutrition+in+fungi+pdf PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094acc90212b---nodinilinapumol.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/92338977969.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/bixofupijurelaxapewudaraj.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160752ab103825---xekemutusabozuvavidek.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/mafasidiviburusagivepol.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161056ac2e5778---jarizu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/novakexakonuzom.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/30375411928.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fe133dc96---zusavanojifetule.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a734357fa---terolosazemix.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/26929346593.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776b7918adc---8546971628.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/nitapedukukid.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wamazuvenelikupu.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/pegekuloziku.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/kaxowu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fc1338abe7ba10dac3840b00487803d0/wutasimafitik.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/vujonuxugapipaxofudazu.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/fizasesubusinekepefow.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/xidumawizuzaxaziduvupen.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160864d23181d8---jokunigogebadesaje.pdfIn PDF document text
    • 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_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA91 10392 bytes
SHA-256: c96f72f13f366bcf5fb8e3b38d6e2eb157201f22d940bbedf1ded562c2cb3112
font_02_sfnt_off000101ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101EF 17936 bytes
SHA-256: 4077192d876b7d576680826788c5b050cb67455df297505bfdda76004a1aa384

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