Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c76573b88c39ff2…

MALICIOUS

PDF

84.1 KB Created: 2021-09-07 19:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b245840bde3ec7021559010614c3e111 SHA-1: 2e1aceebeb0e32aa5cd97677b4736e95f81ae36d SHA-256: 3c76573b88c39ff2f150af102c5d576e8d333cd6230191145a35f6b25cc4c251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be redirecting users to potentially harmful external sites, consistent with phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://dmhu.eu/uploads/uplib/file/jozir.pdf In PDF document text
    • https://mmagame.com/userfiles/file/83428918559.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/035ae0605f97770a192a5220bf5620ad/23259567579.pdfIn PDF document text
    • https://strategieb2b.ca/userfiles/file/zibeberogam.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/qi6prm3btgn3i6tgd3j6nkd2ms/30229907856.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/57784852968.pdfIn PDF document text
    • https://csodamalom.hu/files/files/petebuvibisogilasujisive.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-6-23/20210623023407875775.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/gabopefunasuwo.pdfIn PDF document text
    • https://dbhattacharjee.com/ckfinder/userfiles/files/52217457168.pdfIn PDF document text
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/e7d1b819df5df79eea69afbf00233968/48225326762.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f13e00694---kiduxorekuxufapode.pdfIn PDF document text
    • https://aneri12.eu/res/file/78218483065.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/65829615035.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/2tji3g2g5kietai7brbvpc6m12/92174306581.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/8e2d6492d3a1056e0458e86e9624d7a6/29803675138.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160835c554b176---78555823288.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160979394a0a29---21776186412.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/f7694e4e7117c13e865f75209bf5efef/73780390801.pdfIn PDF document text
    • http://oinworkshop.com/clients/6/6d/6d9161a7191ba42f41383a85782e2f4f/File/koxodafojeto.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/95667374126.pdfIn PDF document text
    • https://altinhediyeler.com/calisma2/files/uploads/mafabejisuvasi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe7483799d.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/texifusitisajapufose.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124578e1e942---litomowuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=yo+yo+test+pdf+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c02fdca3b---95917941593.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_off0000e1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B7 10480 bytes
SHA-256: e32e6843364ab5def7a4d2bd52f9e489e901b5cda0231b3c3582dff9486145b7
font_01_sfnt_off0000f9c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DA 19028 bytes
SHA-256: cce182f8da35594bfab96af4d2bb0789e491620887d5fdd8f374767d58640dae