Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c116e230a6d1e66…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 07:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eb920988ca22175c35d1a6dd9613c42e SHA-1: 747fc741d774bf606896695744a6fa7a4006c9ff SHA-256: 4c116e230a6d1e6660892e4f0f2b128a542fb1697071e7a4b6323458762b0c79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised websites, suggesting an attempt to redirect users to malicious content or downloads. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern. No scripts were extracted, but the structure indicates a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://allseasonsart.com/uploads/fck_uploads/file/10893553761.pdf In PDF document text
    • http://activesolutionelectric.com/images/file/15265829801.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83a257b66---19382114774.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/1487093315.pdfIn PDF document text
    • http://garderoba.sk/images/_file/bodarumubolas.pdfIn PDF document text
    • http://patokapugsnkisses.com/clients/61143/File/jevukib.pdfIn PDF document text
    • http://huiking.cn/uploads/file/052343291975.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/xumifawivoxat.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb8f0dfe31---kufixapogu.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/700566632bf33160aa9bd3d2dd6ea6c3/fomolekufi.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c88a828cf---37721767458.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160900377b3b65---90401011065.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/dedikememikabakaxu.pdfIn PDF document text
    • https://pmms-online.com/assets/file/56354971845.pdfIn PDF document text
    • http://lucann.com/Upload/file/mafalotadubunaxo.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/2e495a39a910ba1284da369e866229f0/17546111351.pdfIn PDF document text
    • http://haki.vn/uploads/files/denovuwujesinowedim.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe1e2ea75---fexubojepi.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/panetelegaj.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/84733051646.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/napubuposexemino.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/52730045956.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=comptia+a%2B+220-901+and+220-902+pdf+downloadPDF 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_off0000ce1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1C 17676 bytes
SHA-256: c49a041a01ed29bd63a0ff9d51ce247cd15220a987bbc7b4fd7deeaea3a854a6
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 10872 bytes
SHA-256: 2d7da3783daa2f12614e3b60025ac3445c0fa5f673de96a9856f60989ab06478

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