Malicious PDF — malware analysis report

Static analysis result for SHA-256 5430e10b66722202…

MALICIOUS

PDF

75.2 KB Created: 2021-08-15 12:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2b4d32b229fb3c30b0e951f32dc3af8 SHA-1: da3c305658f6f6721b14e6f78ebfb11bbc04e98f SHA-256: 5430e10b667222023490354e2b596ea015720dac9b79d9749c1d36e85f877e93
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple potentially compromised websites, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d59947d4cc---24701741073.pdf In PDF document text
    • http://inwama4.vn/webroot/img/files/51393619149.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/84960694608.pdfIn PDF document text
    • https://masukpt1.com/contents//files/54007513667.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/62174c1e188debd4433de6a3993d978f/xetizegavurus.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/13105664405.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/45912224548.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/gemesapubanapurovi.pdfIn PDF document text
    • https://123natura.com/stockages/files/nuxerujesujuwunam.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/777d91a696ba7d72dc37836749f14413/61939561785.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610462f13ec7f---84253225616.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/e7e34d122dfc3f3bc86ffa6f963dd864/duzepu.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/3b4b2f5362a3349bca657b5e263a75ac/91387958893.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6fdacb876ff18914ddf9e663c9f1054a/bogone.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10bb19014b---vetamusipemavegelifarato.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1f9389d982cb5f92fe32a87d8ca747b6/jaxabobovujixera.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5c4fb8bcc5a6c96152361720147b1652/66845748414.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/pubbbutu5nohnaj6fmtbvn2v0a/81869591374.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/46910514070.pdfIn PDF document text
    • http://classtool.info/upload/files/jupevoxaditivajaduronip.pdfIn PDF document text
    • https://lapakunited.com/contents//files/jopozagowawosituseriduzu.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160fa7ceb0f7df---rovugewujexusedutavoka.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/67200524642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ja+finance+park+student+workbook+answer+key+pg+15PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/985093c0bcbff75988ae2e50762c42c2/jonerowinisilamopuvokegu.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/2b2134f7153dc05af4ec3d9f7d4242ad/39852137318.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_off0000c30d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC30D 15576 bytes
SHA-256: 98ad7d563e96f6683431518609a12baf728ed233113b97a1cb754de2d06b8bb6
font_01_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 11456 bytes
SHA-256: faa8044f67e49e4e018789f0678b6e5727c1cb0efd96056cf202f561e69c2718
font_02_sfnt_off0001064f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1