Malicious PDF — malware analysis report

Static analysis result for SHA-256 676ee6ce1a008c6a…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 13:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9695d25ecc51edc342df875ca42e0676 SHA-1: 29d0fc3f32c83ba8758050e3ef0e53b85b9436d7 SHA-256: 676ee6ce1a008c6acd1baf91b43195ffe7baa43169d2ce54661f6b4db173a5f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristics indicate a link farm designed to redirect users, with ClamAV identifying it as a phishing trojan. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://barcelonacentromedico.es/files/galeria/files/61776398760.pdf In PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/lukufe.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/volodaromu.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/b2cb6f462824c08d1d73f45eb595389b/dejubimazemixak.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/60493494970.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/rivunatuviwemiguzu.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/vovorabozi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/503173027.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/6821165838.pdfIn PDF document text
    • https://ka-base.no/images_content/file/84763324842.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/92976312348.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/repopefonololojevarexe.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/jatixolatit.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320389b1381---zifixanezunozerilu.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/dugejap.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/mepenogisipejobimoj.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/lqduaeb5qmv17971a1c8gienk5/tugukaripavugifulo.pdfIn PDF document text
    • http://acelybio.com/upload/files/damebez.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/migude.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/patiwuru.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210907/210907004729123722ys1hrnba0ihv.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/nonakamaziramuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=instagram+download+for+tizen+z2PDF 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_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE408 10912 bytes
SHA-256: 39ba3f251189dab063c96edc21008e39544b448a110a55e6c5bf9c6c8fe48234
font_02_sfnt_off0000fd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2F 19544 bytes
SHA-256: 2b93077da7cb790799b7761d4537f086eabcfc4c01c1a0d2864e40976633178e