Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef48dbec9c254c1c…

MALICIOUS

PDF

98.8 KB Created: 2021-07-17 23:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c3bcd40d6016f9f4328dbe1b902857cd SHA-1: 484adb58897deabfffe46b8cd6bf68d06ebe804c SHA-256: ef48dbec9c254c1c4b5cac4c5449603befd9fa96b309092defca0977cd5849bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://cmsschoolkg.org/userfiles/file/wetejejovakilirasudokanul.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/bc1e2642f0f4b7e7c5aa8879f3df43f3/98943045229.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/dowubebadisozudakelejug.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/benabikokipanerurutub.pdfIn PDF document text
    • http://nakatka.com/files/file/sibosovuzefemofutofud.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/7bfc9a0cad3865dcbfeb012a72f721d3/lokefefepogibonujaxuz.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/rawifi.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3tjdd7s8c4mflnktol0mlh1sk7/26566102180.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5f59604ea---tabesawutu.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/ac7525e75f582bfe3c888396efd61d62/labobidima.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/1e0f955db299e49cf67910d4620730ab/gidet.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/f3bf2ab9ba013ff20c12ec7404743b9a/gexujuniko.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/ilqllo7k5liurv910o5o07e30c/5361004482.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/somokedabizofexo.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9ae3ba87990877b1836bb3731249269a/22587508189.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/88385470868.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/78850227283.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073985fc117a---52643913149.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16071d7ff590a4---firuvezufijurarinup.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe2c008aba---riset.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/md65tn7g8qf8lpcbl36m3rtqt3/91905271685.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d95274e4---butomifajasejubiloda.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/93012130861.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/efpujq30ug3hc97cpnjk80lsg2/pakomufokotufejumunotuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=dr+stone+stone+wars+release+datePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 18288 bytes
SHA-256: 745eafad9f4260abcdcf151989270689bf7f20d04604577e3d92b744e69fdd54
font_01_sfnt_off000123ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EF 10236 bytes
SHA-256: 447789b3e132a2678f7fb11f10382423c35780c36c0a9779fdbd87960fc24250
font_02_sfnt_off00013b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15332 12388 bytes
SHA-256: 2b2296881a792bb6ca89123841c85b26a00b75db6a9a582a10ffcf7aa23bcfb1

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