Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb91ae09741412f…

MALICIOUS

PDF

75.0 KB Created: 2021-09-08 04:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbe4145aa8a944428cebc94b26d12977 SHA-1: 9ed3644ca5c7bdd0168fe1e58bb958098463491e SHA-256: deb91ae09741412fb9083b3169d46dcdfbf16b99c84b0e610041848d889f9d38
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. The PDF structure and link farm heuristics strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://accessiblevehicleservices.com/userfiles/file/nuboxijavomuvevek.pdf In PDF document text
    • http://jljemc.com/upload/files/tonemuxefifuxenu.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nigulojejigusimonuwidixog.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32dd7d46dd---54329537585.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1628888892_1.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/6a2c7a5acfd85631ed04e729d8bb9ad3/41018119554.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a563e73a0c6---kudetelibisabag.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/vamupinalarekofupowa.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/durivewufatumelibewogaje.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/sowowobunixupowenujot.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e5009d6d4---42240310158.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/80676031362.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/2be9ce500178f1215ccff9537d78346a/7549212463.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/b26dc5387817e68295fccb0e51f98994/4822603724.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qpoq73dkuqbhvoc9u6tutas583/burosawum.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rjsp858vft4b7517ck4l8t71p6/sotefuren.pdfIn PDF document text
    • http://oodow.cn/upload/file/210719135518695931xwb3gu20tk2r.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/303e952d49d3614241f12d7b73f38f8d/xegexavosivikikumisax.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9dbc35134c---8732463501.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/279734762.pdfIn PDF document text
    • https://gawwaclsc.com/app/webroot/upload/files/35540704689.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/98222974062.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/1620917795.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/39540575164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=understanding+securities+law+pdfPDF 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_off0000c1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 10868 bytes
SHA-256: e9241e3b8117513d01000e3b923fcc113e7b295c4f3c5c9e45cab10e0cebdf19
font_02_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 16876 bytes
SHA-256: bce9c39ca9048f06a4077d2dcad24263f322fe67a05434ed030ce5b372f0705d