Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd27f5308b8fada…

MALICIOUS

PDF

81.9 KB Created: 2021-08-16 10:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85c0a3c96ce16d48260efefbbe3f7d8d SHA-1: 0349b8bd656f6889d57e2f914e682532f6c94572 SHA-256: 4dd27f5308b8fada61aa8a2f12ae13bc1425ce5d6eace9627a89bdd9f7c4ed53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites and disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0', and ML classification strongly suggests maliciousness. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/onp6vcr2hckr0009ng6eb4qi1p/88648897189.pdf In PDF document text
    • https://martabaktelor.com/contents//files/mumoribisesosebiwev.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/rupixifebokufinumate.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/fuvilule.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/7640666222.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b33987eb---15024232060.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/3d9c0f0fa9a1a8c058d7d35e170b72bd/pebuluwem.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ce3a81e16---jopenexovimoma.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbafc8a353---xajinugexaranagesaluzopa.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fdt1ft6ilq15kt17omlv7d3st6/jexokidoxifunilozufim.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/29442832995.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62a75cc271---baseregofanesalineneke.pdfIn PDF document text
    • https://pisangmanis.com/contents//files/pomojodimadu.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/17814546204.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc7e1fad8---kewenixunefebewifike.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/68910133956.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b74567d7ba9---mawaxamulazisapo.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fh7ob06rnsads94djvej7g2lqo/kirosijakatexunemu.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/bunukojipufetogiv.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160700a3d42f8c---6290924027.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/bumivoramitowo.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/votegaribiw.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/s5f1efoqqlva5peoovcetrg7s2/24508657330.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/mc93neit6q4ro3ifh22o63qeci/60097694571.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/xemup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+add+a+table+of+figures+into+wordPDF 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_off0000dd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B6 10848 bytes
SHA-256: 32d98846d58ed6977613e7ed4575f86125cabe1fc81a96ca79827f946f0c9a79
font_02_sfnt_off00010eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAA 16408 bytes
SHA-256: c5444a4cc3f40bca2be01f2f97d3e54ba6f626bbcd1a85b73643975140cbebb4

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