Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecdbbb03359db97…

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 12:35:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 723846bfaeb69d44ec17cf2c6ea25d4a SHA-1: a28c0aaec64a690782a391b555427746b6b8f669 SHA-256: eecdbbb03359db9711b0d4c1bd7ed7f3f2c8f9b2a80b61e4cde1333e9b641773
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users into clicking through to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82e243bbf0---fozupetorisajafari.pdf In PDF document text
    • http://dichvuhieuchuan.com/upload/files/tuwureraxetojafirer.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/a7b6d6d3d3ece8f21644f97f7058dd72/dinupikagejuro.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3cc3b3b8---8750828682.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/kojuzedidirimexumoru.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/53010272626.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/winigaxiximadekadodi.pdfIn PDF document text
    • http://tzsunup.com/upload/49198424187.pdfIn PDF document text
    • http://esistore.de/userfiles/file/11412290632.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b7fe7745892ee0f574918824b5f9f56a/vojukowavufosifadoxetolid.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/wulutuxulimasedorudaw.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084681504821---fizolov.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5439a0f4794d82bedc1e931028ed6ae/fogufodadomilul.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161206e106d99e---54958924729.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/55484047977.pdfIn PDF document text
    • http://componentcnc.hu/uploads/ckfinder/userfiles/files/17093916811.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/vefumikivaragiveso.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/48438344242.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/godele.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60d196698---latelarob.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/bosofuvewom.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6c0dd77e8---pukel.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/sefija.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/568d174d5eb5251ed23f9a72e4cb39db/jetikojagex.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/xisawesuroreziket.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16121a1b101c22---susesuzasakevezusotibox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=activate+current+worksheet+excel+vbaPDF 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_off0000ff0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0B 10896 bytes
SHA-256: 5f7700ff4f22efb43172351e08b47cbeef601afe0c887a031ef101ed1a5f40bd
font_01_sfnt_off00011857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11857 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13069 18644 bytes
SHA-256: b504220eb822d6ef1a0f4cd5b6121537909dcf1b2c30e34003ffff5c805b0cbc