Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c79e1d3237c1d1…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 21:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 35a9c1b6014e69ca51d5d29bec3eb0a2 SHA-1: 9f39dbbdd72d1e6028cac7e0e3b9f37e16d06ae0 SHA-256: 22c79e1d3237c1d13df667920306b93b2729b2e843e365c0b2f469aeaddbbf09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports its role as a lure or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://oniceh.ru/uplcv?utm_term=restorative+dentistry+book+pdf PDF link annotation
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/93192019349.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/nesot.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/nalusazana.pdfIn PDF document text
    • https://assistenza-termica.it/file/kavanusutidijibal.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/sesonasar.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/64825874258.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/wuniwelarema.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/smpf1l22uvop4q6196oritq5r2/razifutibewiwakara.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/01399df4109c58959c50b80b30b6e438/56812604808.pdfIn PDF document text
    • http://gtshotel.it/images/file/76319353692.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/zavadat.pdfIn PDF document text
    • http://wirheiraten.de/images/file/gexigiwe.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/78204083054.pdfIn PDF document text
    • https://vas-vill.hu/userfiles/file/5706942605.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kabemevufewazogegopug.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13ba12bf3---53319109389.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/0c5434bcad4bf315f5407e6e912bc077/fapekebonan.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/jawewamifibaw.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/semejanadibika.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/247cf01878481f44c023a4f5bccc8e72/bipadolubezaf.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/pid04tnuvlm4iguuolgeqjo861/79827385576.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210706_96C93B77B2F11F9C.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/aae62593f282fd7b8c3f043fa5df7138/5460822393.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d926e848---pekifufubugorogikaxapifil.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/baxap.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_off0000e409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC20 10904 bytes
SHA-256: 199912789658032f3e7b08d49655d3b8cb27d2e2fb7734c012c120a6973d9bec
font_02_sfnt_off00011552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 17624 bytes
SHA-256: fac1a8a3bd086ec908547f7c02c2420811e3f4f752584f2050bfa5fdf94f48ae

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